Filter Presses and Cloths for “Lees Filtration”

How the Filter Press is Used in Winemaking

Filter presses are used for separating solids from liquids across many industries and applications. In the wine industry, the filter press is often referred to as a “lees filter.”

M.W. Watermark 470mm Filter Press Used for Lees Filtration in Winemaking
M.W. Watermark 470mm Filter Press

Lees is the sediment at the bottom of fermentation vessels and includes solids such as grape skins, pulp, stems, seeds and residual yeast. Lees can represent up to 10% of a winery’s total volume, which can be a significant amount in a larger winery. Lees also contain a high percentage of recoverable product, with solids concentrations typically in the range of 20-30%, which lends itself well to dewatering via filter press.

Grapes Used in Winemaking. Source: Wikipedia. Filter Presses and Filter Cloths for Lees Filtration.
Grapes Used in Winemaking. Source: Wikipedia
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How Laundry Wastewater Recycling Makes a Difference

Everyone is looking to make a difference these days, from corporations to individuals, when it comes to the environment. Recycling centers accept plastic, aluminum, and paper to reduce the amount of non-renewable resources being consumed. But what about water? Water is not often considered a non-renewable resource, but it is finite. With so much riding on this limited supply, and especially with parts of the U.S. becoming progressively hotter and drier, conserving and reusing the water we have is becoming an existential issue. Laundry wastewater recycling can make a huge difference in the long-term sustainability of our water-dependent species.

Commercial-scale fabric washing takes place in many hotels and hospitals for their own staff’s needs, or in businesses that cater to restaurants and other enterprises with smaller uniformed staff. For the businesses that are stand-alone operations, water and wastewater costs can comprise up to 50 percent of a company’s total operating costs. By treating, filtering, and returning that water back to the beginning of the cycle, the savings can really add up. In fact, not only is laundry wastewater recycling good for the planet, it’s good for business too. Paying to use more water is, literally, pouring money down the drain!

By cutting down on the need to use our limited resources, laundry wastewater recycling reduces the overall cost of doing business while helping preserve the overall health of our planet.

There are a number of different processes that can be employed in turning the effluent waste from a commercial washing machine back into reusable water, while at the same time reducing waste disposal costs.

Industrial and Commercial Laundry Wastewater Recycling Equipment

M.W. Watermark manufactures industrial clarification and filtration equipment that is utilized in the multi-step treatment and filtration processes common to an industrial or commercial laundry operation. Our product line-up includes filter presses, inclined plate clarifiers and more.

Contact M.W. Watermark today to learn more about how you can save money by recycling laundry wastewater.

About M.W. Watermark

M.W. Watermark wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference in the water business, and as a result, make a positive difference to our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. We also specialize in rebuilding used water treatment equipment. Together, we can make a difference.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Product names, logos, brands, and other trademarks featured or referred to within this document are property of their respective trademark holders. These trademark holders are not affiliated with M.W. Watermark in any way.

Benefits of Recycling Laundry Wastewater

Have you ever paused after opening your water bill and thought, “How can I get this lowered?”

If you run a commercial hotel or similar business that does a lot of on-site linens, then there’s a good chance this question has crossed your mind. Fortunately, M.W. Watermark, a leading manufacturer of wastewater recycling equipment, can help you reduce your company’s utility bills.

M.W. Watermark - Recycling Laundry Wastewater

Water can constitute a significant portion of your company’s expenses. Not only do you have to purchase the fresh water to wash the linens and garments with, but you then have to pay for the subsequent wastewater disposal.

What if you could find a way to reuse that wastewater, effectively diminishing both categories of cost while practicing environmentally friendly processes at the same time? With our products offering of top-quality filter presses, slant plate clarifiers and aftermarket parts and accessories, you can do just that.

M.W. Watermark - Recycling Laundry Wastewater - filter presses, slant plate clarifiers and DAFs

Significantly Save On Costs

According to the EPA, an average hotel spends about 16% of its water usage on laundry operations, ranking just behind domestic and restroom use. M.W. Watermark’s laundry wastewater recycling equipment can help you save on your current water and sewage costs.

M.W. Watermark - Recycling Laundry Wastewater - filter presses, slant plate clarifiers and DAFs

Take A Stand For The Environment

The second major benefit of recycling laundry wastewater goes largely unseen to the visible eye, but is one that definitely makes a powerful impact on the environment. By recycling your washing machines’ water intake, you’re playing a role to help preserve one of Earth’s most important, yet undeniably finite, resources.

M.W. Watermark - Recycling Laundry Wastewater

Plus, once you start to go green, the gate will be opened for you to start considering other eco- and cost-effective alternatives for your business. You’ll be able to become more open and transparent with your local communities and patrons about the steps you’re taking to ensure long-term sustainability.

You may even inspire other companies to start investing in green technology, creating a domino effect toward a better future.

M.W. Watermark is located in Holland, Michigan but serves businesses all around the globe. Give us a call today to get an in-depth look at how recycling laundry wastewater can benefit your business, or request a quote via our online form.

About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2021 M.W. Watermark, L.L.C.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

How to Close/Open a Manual Filter Press

A lot of customers ask us how to close and open a manually-operated hydraulic filter press. We are happy to explain it over the phone, but often it’s easier to watch and learn. Scroll down for step-by-step instructions.

Video: How-to Open/Close a Manual Filter Press
YouTube video

Closing your manual hydraulic filter press

  1. Make sure the valve is open (handle down) and your starting pressure is 0 PSI
  2. Push the follower as far forward as it will go to make room for the hydraulic cylinder.
  3. Flip the cylinder to the clamp position (down)
  4. Make sure your pump handle is unlocked!
  5. Turn the pressure knob toward you
  6. Begin pumping to build pressure
  7. Pump until you reach the required closing pressure (this should be indicated on your gauge, if it isn’t, check your IOM manual for the appropriate closing pressure for your size press). Get as close to the pressure as possible, under pumping will cause a mess and over pumping will fatigue your equipment.
  8. Lock handle in place and close the valve (up)

M.W. Watermark manual hydraulic filter press-closed

Your filter press is now closed!

Opening your filter press

  1. Open valve (down) and release pressure knob (turn away from you)
  2. Flip cylinder up
  3. Pull follower back
  4. Manually shift filter plates to remove filter cake

You can find all of our videos on our website or YouTube.

We check the comments on our blog posts every day, please feel free to leave us a question. Or, contact us.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Expand My Filter Press

Your filter press may have been designed with an expansion piece, also known as a distance piece. If you’re ready to increase its capacity and add more filter plates, the expansion piece must be removed. Please find the removal instructions below.

Expansion Piece Removal How-to Video
YouTube video

Expansion Piece Removal Instructions

  1. Support the expansion piece and remove all of the hardware
  2. Remove the cross support
  3. Pull the follower back and reconnect it to the hydraulic cylinder
  4. Install new filter plates, noting the one-dot, three-dot sequence (see image 4)

Filter Press with Expansion Piece

Filter Press with Expansion Piece

Filter Press with Expansion Piece Removed

Filter Press with Expansion Piece Removed

Expansion Piece Removed and Filter Plates Added to Stack

Expansion Piece Removed and Filter Plates Added to Stack

Filter Plate: 1-3-1 Sequence

In this photo, the plate with the black dots is the tail plate. Filter plates should always alternate between 1’s and 3’s for proper cycling. Filter plate sequencing is crucial to the efficiency and success of your filter press. Learn more about why sequencing your filter plates correctly is crucial to your operation, by reading this blog post.

1-3-1 Filter Plate Sequence

If you’re ready to remove your expansion piece, but don’t have enough filter plates, give our Sales/Service Team a call (616.399.8850) or send us a note. We keep a large variety of sizes in-stock and ready to ship.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Part I: Filter Cloth 101

In the first part of our Filter Cloth 101 series, we’re going to give you the basics: terminology and materials. Please feel free to ask questions in the comments section or give us a call (616.399.8850).

***

It can be easy to look past the filter cloth’s true role in a process, believing that the cloth does the filtering, when in reality most of the filtering gets done by the cake itself forming in the recessed chamber.

Understanding this, it becomes easier to improve the press operation and to adjust to problems and changes.

In this post we’ll cover the basics – filter cloth terminology and different filter cloth materials. If you haven’t already, don’t forget to subscribe to our blog for the next post in the filter cloth series: Part II – Troubleshooting and Frequently Asked Questions.

Filter Cloth 101: Terminology

CGR vs. NG
“CGR” is an acronym for “Caulked, Gasketed, Recessed chamber.” CGR filter plates and cloths should provide a virtually leak-proof filter press. Cloths for these plates are octagon shaped, with a caulking rope or cord sewn into the edge of the cloth.

M.W. Watermark Gasketed (CGR) Filter Cloth and Filter Plate
M.W. Watermark Gasketed (CGR) Filter Cloth and Filter Plate

“NG” means “Non-Gasketed.” The NG filter cloth is faster and simpler to install, though the trade off is that occasionally some dripping can happen when using NG cloths.

M.W. Watermark Non-Gasketed (NG) Filter Cloth and Filter Plate
M.W. Watermark Non-Gasketed (NG) Filter Cloth and Filter Plate

Cloth Blinding
When a cloth’s porosity is hindered, and the cloth no longer allows the filtrate to flow.

Mono-filament Cloth
These fibers are single, smooth extrusions and have high strength. “Mono” cloths have excellent cake release characteristics and resistance to blinding. This style has low particle retention. This material is very similar to fishing line, and has higher tensile strength.

Multi-filament or “Spun” Fibers
Compared to the “Mono” fiber above being similar to fishing line, “Multi-filament” threads, think “yarn”. The fibers vary in size, but are grouped together in a single strand. The main benefit of multi-filament fibers is better particle retention.

Mono-Multi Cloth
This blend of both types of fibers is extremely popular, as it encompasses benefits from both types of thread, in particular, strength from the mono- fiber, and particle capture from the multi-fiber.

Latex Edging
A coating added to the edges of a filter cloth to prevent leaks. This coated edging reduces NG leakage.

CFM
“Cubic Feet per Minute” is the measure of flow or air permeability of the cloth media.

Weave
The most common are plain, twill, and satin:

  • Twill Weave adds a diagonal rib or line to the weave, adding strength at the expense of a little stability. Cake release is average
  • Satin Weave is popular for its excellent cake release and excellent resistance to blinding
  • Plain Weave is average in strength, cake release, and stability

Filter Materials
Filter cloths come in many different materials including polypropylene, polyester, cotton, nylon, felt, and many other materials. The most common filter material:

  • Polypropylene: Polypropylene is the most common material. It has strong resistance to acid and alkali alike. A satin finish added to the fiber can allow for easy cake release. “PP” is a top choice for a wide range of applications, and is by far the most popular material. Latex borders can be applied to a non-gasketed cloth to provide a better seal under pressure.
  • Nylon: This durable fiber is often chosen for its long life in the face of abrasives. Though higher in cost, nylon blends offer such durability that the higher cost can be justified by longer service life.
  • Polyester: Often chosen when sustained operating temperatures are over 180 degrees, or when oxidizing agents are present.

Coming up next in our Filter Cloth 101 series: Troubleshooting and Frequently Asked Questions.

If you have any more questions, feel free to ask in the comments or contact our Sales/Service Staff!

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Part II: Filter Cloth Troubleshooting and FAQ

In Part I of our filter cloth series, Filter Cloth 101 , we covered terminology and material types. In this post we hope to answer frequently asked questions about filter cloths, filter cloth installation, and trouble-shooting.

If we don’t answer all of your questions, please feel free to ask one in the comments section – we’ll get back to you. Or, you can always call our Sales/Services Staff: 616.399.8850.

Filter Cloth FAQ

Q: What is the micron rating of this cloth?

A: Filter cloth does not have a micron rating. Cloth air permeability, or porosity, is measured using the Frazier Air Permeability scale. The unit of measure is cubic foot per minute, or CFM, which is a cloth permeability measurement. The ranges of CFM are wide, and are determined by the thread counts and weight of a fabric.

Q: How can I make the installation of gasketed filter cloths faster?

M.W. Watermark Air Hammer - Filter Cloth Installation Tool
Air Hammer

A: Depending on your press operation, changing cloths can be labor intensive and difficult, and often the down-time is problematic. Here are a few different solutions:

  1. For easier installation: Purchase an air hammer (P/N 4000-0235) which greatly speeds the filter cloth installation.
  2. For less down-time: Purchase additional filter plates to “swap out” between cycles, so you can replace cloths in the extra plates while the press still runs at full capacity.
  3. Let us take care of installation. Send your filter plates with old cloths to M.W. Watermark, and have our staff clean the plates, change the cloths & gaskets, and ship them back. Usually this service can be done within 2-3 days.

If you’re not sure how to install a gasketed filter cloth, take a look at our how-to video/blog post: How to Install a Gasketed Filter Cloth. Here, you can find instructions on How to Install a Non-Gasketed Filter Cloth. Or, give our Sales/Service Team a call (616.399.8850).

Q: My filter cloths are wearing out at the center feed neck/corner feed. What can I do?
A: You can ask for either a latex reinforced cloth, or in an extreme case, a rubber barrel neck to protect against wear in those areas.

Q: How can you test a new filter cloth for our application?
A: First, contact our sales or process experts for a recommendation. Once a cloth type is selected, run a test on a shortened stack in your filter press. This can be done by moving the “end plate” to cut off the stack so that just the test cloths are used.

To protect the plate at the end of the stack, use a back-up plate to support the tail plate. Monitor the pressure, as it will fill fast, and run the press with the shortened stack. You should see results quickly.

Q: Can I clean the cloths with a pressure sprayer?
A: You can, but take care to not get too close with the spray tip. Only use the sprayer in a “fan” spray pattern and keep spray pressure under 1000 PSI.

Q: Can we clean cloths with chemical cleaners?
A: Polypropylene filter cloths can handle both caustic and acidic solutions. Nylon, polyester, and felt cloths need special consideration and may be damaged from these chemicals. Contact M.W. Watermark™ about your specific situation.

Q: How can I extend my cloth life?
A: Filter cloth life is shortened by chemicals, mechanical wear, abrasion, and blinding. We can help to determine whether your cloths are being attacked by your process chemicals. Mechanical wear can be reduced by using a more durable cloth. Blinding often comes from “slamming” sludge into the press.

Consider an Auto Feed Pump Control System, or an AFPCS to automatically and gradually increase pressures. “Pre-coating” a press with DE or similar products can also add substantial life to cloths. The coating protects against wear and minimizes blinding.

Q: How do I install a filter cloth?

A: We have published step-by-step instructions as well as created how-to videos to help you with this task. Please click on the appropriate link for your type of cloth for our installation posts.

Gasketed Filter Cloths (CGR)

M.W. Watermark CGR Filter Cloth

Non-Gasketed Filter Cloths (NG)

M.W. Watermark NG Filter Cloth

Head Filter Cloth (CGR)

M.W. Watermark Head Filter Cloth Installation

If you have any more questions please contact us.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Filter Cloth Installation – Gasketed (CGR)

The performance of your filter press relies on the upkeep of your filter cloths and gasketing. It is a necessary evil. And we know, changing your filter cloths can be… frustrating.

Below is a list of tools needed, step-by-step instructions, and a how-to video to help you install a new CGR filter cloth onto a filter plate.

Tools needed

1) Hammer (we highly recommend the air hammer)

  • Air hammer – product number: 40000235
  • Dead blow hammer – product number: 40000026

2) Wedge (if you’re using the deadblow hammer, this will come in handy) – product number: 40000234W

3) Filter cloths
M.W. Watermark produces filter cloths in-house, learn more here

Filter Cloth Installation Instructions

YouTube video

The instructions below may seem confusing without video, if you have any trouble with the video, let us know.

1) Filter plates should be power washed and clean

2) Roll one side of the filter cloth in half and pull it through the feed eye

3) Align part number with the top of the filter plate

4) Lay filter plate on a flat, sturdy surface

5) Begin tacking filter cloth at corners of filter plate

6) Work into the straight edges

TIP: If you’re using a deadblow hammer rotate the filter plate as you go so you’re always pulling the hammer toward your body, not reaching across the filter plate

TIP: If you’re using an air hammer, run it right along the straight edge to tack in the sides

7) Check for high spots
If you used a deadblow hammer, use a wedge to smooth high spots

8) Flip filter plate over to repeat on the second side

M.W. Watermark stocks all of the tools needed for filter cloth installation; you can find the product numbers above. We can also remove and install filter cloths and gaskets for you.

We check the comments on our blog posts every day, please feel free to ask us questions here or contact us.

About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Filter Cloth Installation – Non-Gasketed (NG)

The performance of your filter press relies on the upkeep of your filter cloths. Filter cloth installation is typically easier when it comes to non-gasketed filter cloths, but it’s still important to get it right.

Below is a list of tools needed, step-by-step instructions, and a how-to video to help you install a new NG filter cloth.

Tools needed

1) Rubber Cloth Dog Washers – product number: 40014498
*Some filter plates use cotter pins instead of rubber grommets

2) Zip ties – product number: 40026739

3) Clippers (nothing fancy, just something to snip excess zip tie)

4) Non-gasketed filter cloths
M.W. Watermark produces filter cloths in-house, learn more here

Filter Cloth Installation Instructions

YouTube video

The instructions below may seem confusing without video, if you have any trouble with the video, let us know.

IMPORTANT TIPS:

>> Filter plates must be power washed and clean

>> It is easier and faster to install cloths with two people

>> If the filter press is sitting on the ground, you can install the cloths while the plates are still in the press (as shown). It is not recommended to install cloths with the filter plates in the frame if the press is over an opening for cake discharge.

1) With the filter cloth on a flat surface, fold one side in half matching up the edges

2) Roll the folded cloth up to the centerfeed hole and fold in half again

3) Push rolled cloth through the centerfeed hole

4) Flatten cloth to plate and turn it so the top of the cloth aligns with the top of the plate

5) A second person should be receiving the rolled cloth and following step 4 on the opposite side of the plate

Top of plate
6) One cloth at a time, lay the top edge of the cloth over the plate, aligning the grommets onto the cloth dogs; every grommet should be over a cloth dog

7) Secure cloth dog with a rubber washer (or cotter pin)

Side of plate
8) Starting on one side, snugly secure grommets on the side of the plate with zip ties, removing the excess zip tie with clippers.

*While you are doing this, be sure you’re checking that the cloth lays flat, flush against the plate handle. Every set of grommets should be secured.

M.W. Watermark stocks all of the tools needed for filter cloth installation; you can find the product numbers above. We can also remove and install filter cloths for you.

We check the comments on our blog posts every day, please feel free to ask us questions here or contact us.

About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Filter Plate Gasket Installation

As tedious as it may be, an important part of filter press maintenance is upkeep of your filter cloths and gasketing. Today we’re going show you proper filter plate gasketing installation and removal.

Tools needed

  • Awl and deburring tool
  • Gasket material – product number varies, please call M.W. Watermark for details
  • Dead blow hammer – product number: 40000026
  • Sharp razor
  • Super glue
  • Soap and water solution in a spray bottle
  • Dry towel

Filter Plate Gasket Installation (and Removal) Video
YouTube video

Filter Plate Gasket Installation (and Removal) Instructions

The instructions below may seem confusing without video, if you have any trouble with the video, let us know.

1) Insert awl and pull up on gasket

2) Pull it out of the plate and discard

3) Check the groove for jagged edges; if found, use deburring tool to smooth

4) Squirt water and soap solution into groove; this lubrication eases installation

5) Insert gasket into the BOTTOM CENTER of plate

6) Begin pounding gasket into groove with deadblow hammer, leaving “humps” every 2-3 inches

7) Continue pounding gasketing material into groove, leaving “humps” every 2-3 inches

IMPORTANT – DO NOT STRETCH OR PULL GASKET MATERIAL

8) When you get all the way around filter plate, match ends of gasket and cut evenly with razor blade leaving about 1/8” of overlap

9) Super glue one end of gasket and press ends together

10) Work your way around the plate, pounding the gasket humps into filter plate groove

11) Check for high spots you may have missed

12) Wipe excess solution off filter plate

O-Ring Installation Video
YouTube video

O-Ring Installation (and Removal) Instructions

The instructions below may seem confusing without video, if you have any trouble with the video, let us know.

1) Insert awl and pull up on o-ring

2) Cut o-ring with a razor so you can determine size needed

3) Straighten o-ring and use it to measure how much gasketing material is needed for the new o-ring
*M.W.Watermark stocks a variety of pre-fit o-ring sizes. If you have pre-fit o-rings, skip steps 2, 3, and 4

4) Super glue ends together prior to installing (hold ends together for 5 seconds)

5) Check opening for jagged edges. If found, use deburring tool to smooth.

6) Spray soap and water solution into groove

7) Set gasket in the hole and pound in all four edges and sides

8) Make sure gasket protrudes above the plate as equally as possible

M.W. Watermark™ stocks many of the tools needed to install filter plate gasketing; you can find the product numbers above. We can also remove and install filter cloths and gaskets for you.

Please let us know if you have any questions by leaving a comment (we check them everyday) or by contacting us.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Air-Operated Filter Press: Setting Hydraulic Relief Pressure

We are frequently asked how to set and check hydraulic relief pressure on an air-operated filter press. The following post includes tools needed, a breakdown of the important hydraulic components, necessary filter press information, and an instructional video. In the video you will learn how to set your relief valve pressure and your working pump pressure.

pump-regulator-and-relief-valve_filter-press
Inside the hydraulic cabinet: To set the relief pressure, you will only need to adjust the relief valve and the pump regulator.

Tools needed

  • Allen wrench (T-handle, if you have it)
  • Small wrench

Hydraulic components

  • Pump regulator: Controls the pump pressure
  • Relief valve: Controls relief pressure

Necessary filter press information

  • Relief pressure
  • Hydraulic clamping pressure

This information can be found in your IOM Manual. If you have an M.W. Watermark filter press, you can also find this info on the label in the hydraulic cabinet. It is important to note that the process for setting the relief valve pressures is the same no matter what size the filter press is, but the pressures are not. Both your relief pressure and hydraulic clamping pressure vary depending on what size filter press you have. It is critical that you check this information prior to beginning this process.

serial-number-filter-press
Label inside hydraulic cabinet

Video: Setting Hydraulic Relief Pressure on an Air-Operated Filter Press

YouTube video

Video transcript

Today we want to set the relief valve on an air-operated filter press hydraulic system. You want to remove the cap and loosen the jam nut. This is a new, unproven part so we want to start at 0 psi. We have the filter press closed right now with no pressure on it.

Back the relief valve out, back the pump regulator off so that it has no pressure potential. Turn the pump on to build hydraulic pressure.

Turn the relief valve clockwise to gradually increase pressure.

Right now we’re relieving at about 15-1600 psi so we just proved the relief valve works at a low pressure. The pump is still running; it’s dumping pressure over the relief.

We can gradually increase the relief valve pressure, now the pump is slowing down so we’ll increase the pump pressure a little bit. Now we’re relieving at 2200 psi, we can increase the pressure. Pump stalled out so we need to give it some more pressure on the regulator.

Now we’re relieving at 3000. We’re just proving that it’s working in a safe manner all the way up. This particular press relieves at 4900 so we want to gradually work our way up to 4900.

Right there we’re at our 4900 psi. Lock the locknut down, double check our setting, setting looks good, then we’ll back off our pump regulator to make the pump stall out. Then we’ll bleed some pressure off; and then restart the pump.

We want to set the pump to the filter press working pressure. This is a 630 mm Watermark press so this one, this one working pressure is 4500 psi.

We have the pump stalling at 4500 gauge pressure. Lock the regulator down and we’re good to run the press. (Don’t forget to put the cap back on the relief valve!)

Please let us know if you have any questions by leaving a comment (we check them everyday) or by contacting us.

About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Reduce Filter Press Capacity Using a Back Up Filter Plate

Why would I run a shorter filter press cycle?

If the slurry batch being fed to your filter press varies, you may need to shorten your plate stack. This will allow the filter press to run at reduced capacity and will shorten your press cycle.

What’s a back up filter plate?

A blanking or back up filter plate is a solid backing plate that provides structural support for the tail plate so it can be inserted at any position in the plate stack to isolate the chambers between the tail plate and the manifold end of the filter press.

back up / blanking filter plate
Back Up / Blanking Filter Plate

Why do I need a back up plate? Can’t I just move my tail plate?

No! The back up plate is a solid plate made of polypropylene that provides support for the web of the recessed chamber in the tail plate so it does not deform into the recess of another filter plate. If you move your tail plate without a back up plate for support you run the risk of damaging your plate stack. Replacing filter plates is expensive.

intermediate filter plate, tail filter plate, back up filter plate
Intermediate, Tail, and Back Up Filter Plates

Video: How-to reduce your filter press capacity using a back up plate

YouTube video

Instructions:

1. If you shorten your filter plate stack it is crucial to note proper 1-3 plate sequence.

2. Our tail plate is a #3 so to shorten the stack it must replace another #3 plate.

filter press full capacity
Filter Press Full Capacity

3. To shorten the plate stack:

A) Open the filter press and then remove the tail plate and the back up plate; set aside.

B) Slide plates back toward the follower to the desired capacity.

C) Replace an appropriate plate within the stack with the tail plate. (If your tail plate is a #3, you should replace a #3 filter plate.)

Reducing Filter Press Capacity
Reducing Filter Press Capacity

D) When you close your filter press, you will be operating at reduced capacity.

filter press reduced capacity
Filter Press Reduced Capacity

4. You can move your tail plate up the stack as far as you would like. If you are running a test, you can bring the press all the way down to one chamber.

5. No matter where you move your tail plate within the plate stack, always place your back up plate after the tail plate in the sequence or you are running the risk of damaging your tail plate.

6. To run at full capacity, move the tail plate and the back up plate back to their original positions and close the press.

Please let us know if you have any questions by leaving a comment (we check them everyday) or by contacting us.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Head Filter Cloth Installation How-to

Properly installing the head filter cloth on your filter press is crucial to your equipment’s performance. Below is a list of tools needed, a how-to video and, step-by-step instruction to help you through the process.

Tools needed

Awl
Awl

• (Very) sharp razor blade or a hot knife tool

• Sharpie

Air Hammer
Air Hammer

• Awl

• Hammer (we highly recommend an air hammer)

>> Air hammer / Product number: 40000235
>> Dead blow hammer / Product number: 40000026

M.W. Watelrmark Deadblow Hammer - Filter Cloth Installation Tools
Deadblow Hammer

Video: How to Install a Head Filter Cloth

YouTube video

Filter Press Head Cloth Removal & Installation Instructions

Before you begin, make sure the other filter plates have been pushed to the other end of the filter press (or removed) so you have enough room to work.

1) Unscrew the clip nut from the center feed piping.

2) Using an awl, pull the filter cloth away from the top of the plate (starting in the center).

3) Pull the filter cloth away from the plate.

>> Make sure your filter plates have been power washed and cleaned before installing new filter cloths!

4) Line up the new filter cloth on filter plate, cake side out, aligning the product number at the top of the plate.

5) Beginning with the corners of the filter plate, use your hammer to tack the filter cloth in place.

6) Continue tacking around the sides, smoothing out any bumps in the filter cloth.

7) Once the filter cloth has been installed, use your hand to apply pressure to the cloth to find the outline of the center feed hole.

8) Use your sharpie to trace the center feed hole.

trace centerfeed on filter cloth with a sharpie
Trace centerfeed using sharpie (still from video)

9) Using a very sharp razor blade or hot knife tool cut along the traced line; be very careful to not snag or fray the filter cloth
>> TIP: If you are cutting your cloth hole outside of your filter press you can use an old cloth as a template to trace center feed hole with a hot knife tool

10) Screw clip nut back on center feed piping until tight.

Check out the video above to watch our service tech do a seamless installation.

M.W. Watermark stocks many of the tools needed for filter cloth installation; you can find the product numbers above. We can also remove and install filter cloths and gaskets for you. Call or email for details.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Troubleshooting Your Filter Press Air Hydraulic System

We have cataloged a few common issues & troubleshooting tips for air-over-oil filter press hydraulics. If you have any other questions, give us a call: 616.399.8850

***

1) My hydraulic pump won’t stop running after the filter press achieves clamp pressure.

Inspect the fittings, hydraulic components, and exhaust muffler for loss of oil.

If there’s no loss of oil…
>> The relief valve could be failing. Try to reset the relief pressure (instructions to do this can be found by clicking here).

>> If relief valve can’t be set to hold pressure, it may need to be replaced.

If there is a loss of oil…
>> Identify the leak and repair at the fittings.

If oil is leaking from the exhaust muffler…
See #2

2) There is a large amount of oil leaking from my exhaust muffler.

Oil leaking from your exhaust muffler is the result of either damaged cylinder seals or a damaged cylinder.

A damaged cylinder allows oil to leak into the air portion of the cylinder and the oil travels out of the exhaust. The solution is to rebuild or replace the cylinder.

Damaged cylinder seals can be replaced. Air-over-oil hydraulic cylinders have special seals for this application; please contact us for OEM replacement seal kits.

3) How often should I change my oil?

M.W. Watermark recommends annual oil changes on an air-over-oil filter press. As compressed air is introduced into the oil with each cycle, the oil absorbs moisture from the air. This can cause premature failure in components if the oil is not changed regularly.

4) What type of oil should I use?

We recommend a high quality ISO-46 for air-over-oil hydraulic systems.

If you have any other questions (or if this sounds like your filter press), contact our Sales & Service Team and they will happily help you: 616.399.8850.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Types of Filter Plates

There are three basic categories of filter press plates: recessed chamber, membrane squeeze (diaphragm squeeze) and plate and frame. Continue reading to learn the differences between each type of design.

Recessed Chamber Filter Press Plates

cgr-recessed-chamber-filter-plates
Gasketed (CGR) Filter Plates

These filter plates are utilized in various brands of recessed chamber filter presses, and represent the most commonly used plate.

  • The filter plates are stronger and have a higher fill pressure than plates and frame
  • Gasketed, virtually leak free (CGR)
  • Allows for mechanical plate shifting
  • Non-gasketed available (NG)

CGR vs. NG Filter Plates

“CGR” is an acronym for “Caulked, Gasketed, Recessed chamber.” CGR filter plates should provide a virtually leak-proof filter press. Filter cloths for these plates are octagon shaped, with a caulking rope or cord sewn into the edge of the cloth.

“NG” means “Non-Gasketed.” The NG cloth is faster and simpler to install, though the tradeoff is that occasionally some dripping can happen when using NG cloths.

To learn more about filter cloths, take a look at this blog post.

CGR filter plate in press; Recessed filter plates; Recessed Plate Filter Press
Caulked, Gasketed, Recessed Chamber (CGR) Filter Plate in Press
NG filter plate in press; Recessed filter plates; Recessed Plate Filter Press
Non-Gasketed (NG) Filter Plate in Press

Membrane Squeeze Filter Plates (Diaphgragm Squeeze)

M.W. Watermark Membrane Filter Press Plates; Membrane Squeeze Filter Press Design

These filter plates are utilized in a membrane squeeze filter press and are designed for unique applications. This type of plate is also more costly than recessed chamber plates. Using diaphragm/membrane squeeze filter press plates may result in significant additional fluid removal and/or cycle time reduction if the filter cake is compressible.

M.W. Watermark Membrane Filter Press Plate; Membrane Squeeze Filter Press Design

These are considerations that our Sales and Service Team keeps in mind when recommending membrane squeeze plates:

  • The filter cake is compressible
  • Slurry has higher than average solids
  • Time is money – the time saved by the squeeze justifies more expensive equipment
  • The slurry has variable volume
M.W. Watermark Membrane Squeeze Plate with Replaceable Diaphragm; Membrane Squeeze Filter Press Design M.W. Watermark Membrane Squeeze Plate with Replaceable Diaphragm; Membrane Squeeze Filter Press
Membrane Squeeze Plate with Welded Diaphragm

M.W. Watermark Membrane Squeeze Plate with Replaceable Diaphragm; Membrane Squeeze Filter Press
Membrane Squeeze Plate with
Replaceable Diaphragm

In a typical filter press application, approximately 80% of the solids are pumped into the press in the first half of the cycle, with the remaining half considered the consolidation stage. With membrane squeeze, the cycle is shortened and the cake moisture content is reduced (see chart).

diaphram squeeze filter press plates - graph, diagram; membrane squeeze filter press

The result is increased throughput and better liquid recovery. Adding membrane squeeze to a filter press requires a specialized plate stack, a squeeze water manifold, and a filter plate pressurization system. Typically, membrane plates are alternated with standard chamber plates in a “mixed pack” as shown in the photo below.

membrane-squeeze-filter-press; membrane filter press design

Contact M.W. Watermark to discuss which type of membrane squeeze plate may be best suited for your particular application. If chemical compatibility is a concern, various materials of construction are available for replaceable diaphragms, including EPDM, NBR, Viton, and more.

Plate and Frame Filter Press Plates

plate-and-frame-filter plate Plate and frame is the oldest of the filter plate designs, but is still useful in certain applications.

  • Used for fine filtration where filter paper may be required
  • Allows for different filter cake thicknesses by adding a thicker or thinner frame
  • Filter cloth drapes over plate
  • You should expect some leakage
  • Operated at lower pressures
  • Applications:
    • Polishing
    • Specialty chemicals
M.W. Watermark Plate and Frame Filter Press
M.W. Watermark Plate and Frame Filter Press

Contact our Sales and Service Team to learn more or request a quote today.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Sidebar Filter Press vs. Overhead Filter Press

As a leader in the wastewater treatment equipment industry, it’s important to M.W. Watermark that we provide our customers with options to suit their unique needs. Because of that, we manufacture two different styles of filter press frames: sidebar and overhead. Our Capital Sales Team can help you choose which frame type would be the best fit for your application, as well as size your press appropriately, but here’s a guide to the difference between the two styles.

Sidebar-style Filter Press

It’s worth noting that the sidebar filter press is by far the most common style.

  • The filter plates are suspended by handles that rest on the sidebar.
  • The hydraulic cylinder keeps the filter pack closed during the filtration cycle.
  • Sidebar presses can be sized from 250mm to 2000mm (.01 – 600 cubic feet).
  • M.W. Watermark presses come outfitted with a 304 stainless steel sidebar wear cap
  • Sidebar filter presses are available 100 psi and 225 psi.
sidebar filter press
Sidebar Filter Press (630mm)
sidebar filter press - filter plate handles
Filter Plate Handles on Sidebar

Overhead-style Filter Press

  • The filter plates suspended from above, making the filter plate stack easily accessible to the operator.
  • Overhead style presses are sized 1200mm to 2000m (100 – 600 cubic feet)
  • These presses are typically fully automated.
  • Compression close is standard; tension close may be used.
overhead filter press
Overhead Filter Press (1500mm)
overhead filter press - filter plate handles - 2
Overhead-style Filter Plate Handles
overhead filter press - filter plate handles - 1
Overhead-style Filter Plate Suspension
© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Sequencing Your Filter Plates

Extend the life of your M.W. Watermark™ wastewater treatment equipment by correctly sequencing your filter plates

For your wastewater treatment equipment to create the best filter cake formation during a filtration cycle, your filter plates need to be properly sequenced in your filter press. This allows all four corners of the chamber to drain. Having plates out of sequence only allows drainage from one side of the chamber. This will produce sloppy, sticky cakes instead of firm, fudge-like slabs.

bad-filter-cake
Sloppy, porridge-like filter cake. This is not good!

Proper plate sequencing is referred to as 1-3-1-3 sequencing, which involves alternating the #1 and #3 filter plates. The difference between #1 and #3 filter plates are where they’re ported. You can read more about that below.

A tip from our Sales Team

Once your filter plates are in the right order, number them starting with your head plate to the tail plate (1-…). This keeps them in the correct order and helps you easily identify any potential issues (leaky plates).

numbered-filter-plates
Filter plates numbered in press

Filter Plate Porting

M.W. Watermark™ wastewater treatment equipment includes a minimum of four variations of filter plates in any given filter press:

  1. Head Plate: This is a #1 plate and is the closest plate to the manifold; you will not be able to pull this plate away from the steel frame, unless you have a connection plate.
  2. Tail Plate: This plate indicates the end of the plate stack.
  3. #1 Intermediate Plate: These filter plates are noted with a single dot on the plate. They are ported in the right hand corners (from piping end of press).
  4. #3 Intermediate Plate: These filter plates are noted with three dots lined up vertically on the plate. #3 plates are ported in the left hand corners (from piping end of press).
  5. Optional Blanking Plate: Learn more about how a blanking plate functions by reading this blog post.

**For non-gasketed filter plates, #1 and #3 plates can be identified by the color of the cloth dog pins, or by the number of dimples on the side of each plate.

head-plate-ported
Head Plate
back-of-tail-plate
Tail Plate
#1 intermediate filter plates ported, arrows showing ports
#1 plate ports (there are also ports under the cloths you cannot see).
L-R; Tail plate, ported #3 plate, #1 plate.
L-R; Tail plate, ported #3 plate, #1 plate.
1 plate and 3 plate in press-no filter cloth
Porting on the face of #1 and #3 intermediate filter plates.

The filter plates are ported this way because it forces air or fluid (depending on the operation) to fill up the entire chamber of plates from top to bottom, front to back.

Post-Filtration

Filter plate sequencing is also imperative to post-filtration operations, such as air blow. The air blow of the filter cake is performed to remove filtrate from the filter cake and residual filtrate from the filter pack porting connections prior to cake discharge. Pressurized air is introduced into the upper left filtrate discharge port, forced through the cloth and filter cake in each chamber and out of the lower right discharge port. This effectively purges your wastewater treatment equipment of buildup.

  • The #3 plate has discharge ports on the top & bottom left hand side of the plate and air is only allowed to enter into the upper left hand discharge eye (from piping end of press).
  • The air can only get into the #3 plate, since this is the plate with discharge ports on the left.
  • The air will split and go into the chamber on either side of the #3 plate.
  • The air must travel completely through the cake from the top left to the bottom right.
  • The air exits the bottom right of the #1 plate (because this is the only exit valve open and the #1 plate has discharge eyes only on the right hand side).
1-3-1 Filter Plate Sequence
1-3-1 Filter Plate Sequence

The removal of excess filtrate will improve cake dryness and help loosen the filter cake for improved cake release. If you don’t get a good air blow, you’ll get water running out of your plates when you open your filter press.

If you have any questions about filter plates, contact our Sales & Service Team at 616.399.8850.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

 

Is It Time to Replace Your Sludge Dryer?

Introducing the M.W. Watermark Continuous Sludge Dryer

M.W. Watermark Continuous Sludge Dryer - DM-380G Control Panel Side View

In M.W. Watermark’s latest effort to help you make a difference, we are pleased to announce the latest addition to our lines of top quality dewatering products: The M.W. Watermark Continuous Sludge Dryer. Our dryer is intended primarily to dry metal hydroxide plating wastes where the input to the dryer is the output filter cake from a filter press. There are two models of the dryer available, the DM-200G and the DM-380G.

These dryers can process as much as three and six cubic feet of filter cake every hour respectively, and are of the batch input/continuous processing type. Both models can utilize either natural or LP gas. They work in tandem with a filter press and are manufactured in our facilities in Holland, Michigan.

The M.W. Watermark Continuous Sludge Dryer serves as a direct replacement for currently installed continuous dryers, with a drop-in footprint for compatibility and ease of installation. Our dryer also features several significant improvements over existing continuous dryers.

  • User-friendly PLC touch screen control with fault alarms
  • Standard stainless steel cake hopper
  • Easy external access to high-temperature bearings
  • Oversized extruder gearbox with AC drive

Our sales, engineering and service teams have many years of experience working with and servicing these types of dryers.

M.W. Watermark will also continue to offer expert aftermarket support for all other similar brands of dryers.

Contact our Sales and Service Team Today for More Information or for a Quote

M.W. Watermark

4660 136th Ave., Holland, MI 49424

(p) 616.399.8850 (f) 616.399.8860

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

 

Custom Filter Press Cloths – Delivered Quickly

In case you haven’t heard, M.W. Watermark makes filter press cloths for all makes and models of filter presses. Filter cloths can be sewn to the specifications of your filter press, guaranteeing a perfect fit. All cloths are made right here in the U.S.A. in our facility in Holland, Michigan.

M.W. Watermark offers:
  • Gasketed (CGR) and Non-Gasketed (NG) filter press cloths
  • Latex additions to minimize leakage
  • Custom patterns and styles
  • Fast lead times: a higher volume of standard cloths and rolled goods are now stocked for quick shipping

M.W. Watermark Filter Press Cloths M.W. Watermark Filter Press Cloths M.W. Watermark Filter Press Cloths M.W. Watermark Filter Press Cloths

As part of our latest effort to help you make a difference, we have recently made several improvements that allow us to offer competitive prices on high quality filter cloths and accessories – while at the same time, providing our customers with the best customer service.

  • We have expanded our operation to include a second laser that can cut cloth around the clock – allowing for faster lead times on custom orders.
  • We now keep a higher volume of standard filter cloth media in-stock.
  • Our filter cloth production team has grown exponentially with experienced sewing staff.

What these improvements mean for you as our customer is more options and shorter lead times – to help get you back up and running faster.

Filter cloths are the front line of a filtering process, serving as the foundation needed to build a filter cake. Don’t settle for less than the best.

M.W. Watermark Filter Press Cloths M.W. Watermark Filter Press Cloths M.W. Watermark Filter Press Cloths M.W. Watermark Filter Press Cloths

Visit our Filter Cloth 101 web page to watch filter cloth installation videos and review FAQs, terms and troubleshooting tips.

To learn more about how M.W. Watermark can assist you with your filter cloth needs, please contact our Sales and Service Team.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

 

M.W. Watermark Retrofit Hydraulic Power Unit (HPU)

M.W. Watermark Retrofit Hydraulic Power Unit (HPU) M.W. Watermark Retrofit Hydraulic Power Unit (HPU)

M.W. Watermark wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference in the water business, and as a result, make a positive difference to our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing water and wastewater treatment equipment. Together, we can make a difference.

If you are in need of an emergency fix for your hydraulic pumping system, but are not ready to replace or refurbish your filter press, then M.W. Watermark has a great solution for you.

As part of our ongoing efforts to make a difference, M.W. Watermark has designed a stand-alone Hydraulic Power Unit (HPU) which serves as a universal retrofit for older-style filter presses.

The HPU is available with either a 7 or an 11-gallon reservoir. These two size options should cover most types of filter presses, from 630mm to 1200mm in filter plate size. Simply attach a supply airline and two hydraulic cylinder lines to the HPU to get your filter press back up and running.

M.W. Watermark Retrofit Hydraulic Power Unit (HPU) Diagram

The system is air-powered and will pump the press open and closed with hydraulic oil on both sides of the cylinder.

The HPU has a 55:1 pump ratio, and will operate up to an 8 x 24″ cylinder with a maximum clamp pressure of 4,600 PSI.

As always, M.W. Watermark will continue to stock all air over oil hydraulic parts for models from other filter press manufacturers.

Contact the M.W. Watermark Sales and Service Team of experts today to learn more or for a quote.

For regular updates, be sure to follow us on LinkedIn.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

M.W. Watermark Provides Online Library of How-To and Filter Press Service Videos

Did you know that M.W. Watermark keeps an ongoing library of how-to and filter press service videos?

M.W. Watermark wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference in the water business, and as a result, make a positive difference to our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing water and wastewater treatment equipment. Together, we can make a difference.

This collection of videos is maintained with you in mind as our customer. In our efforts to help you make a difference, we are driven by a desire to make our dewatering and filter press equipment safe and easy to use. We want you to have the complete picture when it comes to knowing how to effectively operate our machinery.

Sample How-To and Filter Press Service Videos (clicking on each video image will open full library webpage)

M.W. Watermark Filter Press Service Videos - How to Set Hydraulic Relief Valve Pressure on a Filter Press

M..W. Watermark Filter Press Service Videos - How to Open and Close a Filter Press with Manual Hydraulics

The instructional videos currently in our library are designed to help you understand the function and safe operation of some of our more popular products. These include the self-dumping cake hopper, automatic and semi-automatic plate shifters, as well as our new and refurbished filter presses.

There are also filter press service videos demonstrating step-by-step instructions for the installation and removal of o-rings, periphery gaskets, distance pieces, head cloths, and both gasketed and non-gasketed filter cloths. Whether you are having a specific issue with your filter press, or installing brand new machinery and want to get the job done right the first time, these videos will guide you through the process.

Additional Sample How-To and Filter Press Service Videos (clicking on each video image will open full library webpage)

M.W. Watermark Filter Press Service Videos - How to Install a Filter Cloth - CGR - Gasketed

M.W. Watermark Filter Press Service Videos - How to Install a Filter Cloth - NG - Non-Gasketed

Check out our full library of how-to and service videos with step-by-step instructions to help you get the most out of your M.W. Watermark purchase.

If you have questions or concerns about something not currently covered in our service video library, feel free to contact our Sales and Service team.

At M.W. Watermark, customer satisfaction is our top priority!

For regular updates, follow M.W. Watermark on LinkedIn.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.

Materials of Construction: Considerations When Purchasing a Filter Press or Aftermarket Parts

M.W. Watermark™ would like to present some thought starters to you – on the multiple factors to consider when planning the types of materials of construction that are needed in a filter press to adequately handle the job at hand.

The first question to always ask is, “What is the slurry?”

The temperature, pressure, pH, chemical compatibility and abrasiveness of the slurry can each play an important role when selecting filter press components.

For example, materials that perform well at room temperature do not always hold up at a higher temperature, such as 200 degrees Fahrenheit. An abrasive slurry such as occurs during lime dewatering can be hard on filter cloths, and cause premature wear. However, at the same time it is critical to choose the right fabric for the optimum formation of a filter cake.

M.W. Watermark Filter Press Materials of Construction: CGR Filter Cloths
Polypropylene Filter Cloths for CGR (Caulked, Gasketed, Recessed Chamber) Plates
M.W. Watermark - Filter Press Materials of Construction: Gasketed Filter Plates and CGR Filter Cloths
Gasketed (Viton®) Filter Plates with Installed Polypropylene Mono/Multi-Filament Filter Cloths

Polypropylene is the standard for filter cloths and performs ideally in most applications. This material can withstand higher temperatures, does not easily succumb to blinding (clogging of the weave) and has a smooth surface which aids in cake removal. However, it’s important to know the make-up of the slurry before assuming that polypropylene is the material of choice. For example, if the slurry is bleach, polypropylene will not be compatible, and polyester filter cloth materials must be used.

M.W. Watermark Filter Press Materials of Construction: NG Filter Cloths
Polypropylene Filter Cloths for NG (Non-Gasketed) Plates

Piping can also be affected by the type of slurry being dewatered. Potential piping materials include: PVC (standard), Polypropylene, CPVC, carbon steel, and stainless steel. A combination of EPDM (Ethylene Propylene Diene Monomer, or M-class) rubber and stainless steel is the least expensive for piping and gasketing, but depending on the chemicals in the slurry, a nylon coating may also be required. Depending on the pH of the chemical, Viton® (also referred to as FKM) may also be needed instead of EPDM.

M.W. Watermark Filter Press Materials of Construction: EPDM O Ring Gaskets
EPDM O-Ring Gaskets

Slurries with a high temperature can also cause pressure issues, causing standard threaded connections to no longer be adequate. Or, if the application is in the food industry, threaded connections cannot be used. In this case, a different piping material may need to be used, such as stainless versus PVC, or the piping itself may need to be flanged.

M.W. Watermark Filter Press Materials of Construction: Flanged Stainless Steel Centerfeed Pipe
Flanged Stainless Steel Centerfeed Pipe

The selection of gasketing and seals can also be affected by the composition of the slurry. EPDM is standard material for gasketing, however, a slurry such as biodiesel will cause EPDM to become gummy. In this case, Viton® (FKM) becomes the ideal choice of material.

M.W. Watermark - Filter Press Materials of Construction: Stainless Steel Manifold Piping with Viton Gasketing
Stainless Steel Manifold Piping with Viton® Gasketing

By now we can see that the chemical make-up of the slurry has an effect on many of the filter press parts and components. Even the sludge pump is affected by the nature of the slurry it is pushing through. Potential pump materials can include: Polypropylene, carbon steel or stainless steel.

M.W. Watermark - Filter Press Materials of Construction: Viton and Polypropylene AOD Pump Skid
Viton® and Polypropylene AOD Pump Skid

One final, yet very important filter press component to consider is the hardware and fasteners. Hardware must be carefully selected to be compatible with the wetted material moving through the press.

For example, a steel company needed M.W. Watermark’s assistance with slurry that was dissolving both stainless steel and nylon. It dissolved multiple sets of hardware. Watermark’s Service and Engineering teams found that the only hardware and piping combination that was chemically compatible was titanium – and the head plate had to be re-worked to include a caulking groove for the head cloth.

Another solution that M.W. Watermark offers for enhanced resistance to corrosion and wear is the EnduroLiner™ coating. EnduroLiner™ is a polyurea/polyurethane spray-on coating that exhibits excellent adhesion for seamless protection from wear and abrasion. EnduroLiner™ also provides excellent UV light, chemical, and moisture resistance necessary for demanding applications.

M.W. Watermark Filter Press Materials of Construction: EnduroLiner™ Coated Filter Press and Cake Hopper

Hopefully, this blog posting gives you a general sense of materials of construction factors to start thinking about when considering the purchase of a filter press, and later, any aftermarket replacement parts you may need.

Because each of the filter presses we build are customized based on our customer’s specific application, we recommend contacting the M.W. Watermark Sales and Service team to discuss the best components for your situation.

Contact the M.W. Watermark Sales and Service Team today to discuss your specific application.

About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

What Is a Slant Plate Clarifier?

A slant plate clarifier is used in industrial water treatment applications to provide low cost, yet extremely efficient solids removal from a wide range of waste and process liquids.

The key advantage of slant plate clarifiers over conventional types of clarifiers is the use of a series of inclined plates. These plates are able to provide a large settling area for particles and allow for a more compact footprint, greatly reducing the floor space needed for accomplishing the same result.

In fact, this inclined plate design allows the settling area, or surface area, to be as much as 10 times more than the actual floor space occupied by the clarifier. This significant reduction of the required floor space is achieved by reducing separation between plates to just two inches, and stacking the settling surfaces at an angle. The bottom line advantage to the slant plate design is getting the maximum square footage out of your production floor space, which translates into greater efficiencies and cost savings for your operation. Because the slant plate clarifier uses inclined plates, it is often referred to as an “inclined plate clarifier.” A slant plate clarifier is also referred to as an “SPC.”

M.W. Watermark Slant Plate Clarifier - Space Saving Design; Inclined Plate Clarifier;
Slant Plate Clarifier – Space Saving Design

The reduced required footprint of an SPC provides the opportunity for the clarifier to be located indoors, which allows for better control of ambient conditions. The use of inclined plates also allows the SPC clarifier to operate with flow rates 2 to 5 times that of horizontal clarifiers in a given footprint.

Another advantage worth noting is the SPC’s general absence of moving parts. In many cases, the only mechanical component is the influent pump, which translates into less chance for mechanical failure, a safer environment, and cost savings in energy consumption over traditional clarifiers.

To learn more about how a slant plate clarifier works, click here.

M.W. Watermark - Slant Plate Clarifier System Design; Inclined Plate Clarifier;
Slant Plate Clarifier System Design

What type of industries/applications are clarifiers used for?

Clarifiers are ideally suited for:

-Industrial wastewater solids
-Metal finishing operations
-Chemical processing
-Foundries
-Power plants
-Mining industry fines
-Steel & aluminum plants
-Process water clarification
-Applications which require separation of suspended solids

M.W. Watermark Inclined Plate Clarifiers; Slant Plate Clarifier Series

M.W. Watermark Offers Inclined Plate Design in Slant Plate Clarifier (SPC) Series

As part of our ongoing efforts to make a difference, and provide the most innovative wastewater treatment equipment available, M.W. Watermark is pleased to offer a full line of Slant Plate Clarifier (SPC) products following the highly beneficial inclined plate design.

M.W. Watermark’s Slant Plate Clarifier series is designed to be tough and dependable, while at the same time being sensitive to tight budgets and maximizing production space. We have nine SPC models available, each with increasing capacities, to cover a wide range of design flow needs. Our Slant Plate Clarifier models range from 5 to 400 GPM. Each of our high-quality SPC models is made in the U.S.A. in our facility in Holland, Michigan, by our experienced production team.

 

M.W. Watermark - Slant Plate Clarifier - Top View: Showing flash mixing tank, flocculation tank, and inclined plates;
Slant Plate Clarifier – Top View: Showing flash mixing tank, flocculation tank, and inclined plates
M.W. Watermark - Slant Plate Clarifier Series - SPC-10; inclined plate clarifier;
M.W. Watermark – Slant Plate Clarifier Series – SPC-10

M.W. Watermark Slant Plate Clarifier (SPC) Series – Features Summary:

-Standard sizes from 5 to 400 GPM
-No moving parts
-Compact size minimizes floor space requirements
-Integral flash mixing and flocculation tanks for increased efficiency
-Heavy-duty ¼” steel construction, welds are dye-penetrant tested
-Entire structure is sandblasted and two coats of epoxy is applied – ensuring full coverage and superior chemical resistance
-1/4” PVC removable settling plates
-Dual sludge outlet flanges
-Large side-access hatch
-Sludge sampling ports

Key Takeaway: The M.W. Watermark Slant Plate Clarifier (SPC) series is designed to provide low cost, yet extremely efficient solids removal from a wide range of waste and process liquids.

M.W. Watermark - Slant Plate Clarifier Series - SPC-20; inclined plate clarifier;
M.W. Watermark – Slant Plate Clarifier Series – SPC-20
M.W. Watermark - Slant Plate Clarifier Series - SPC-80; inclined plate clarifier;
M.W. Watermark – Slant Plate Clarifier Series – SPC-80
M.W. Watermark Slant Plate Wastewater Clarifier Series; SPC-150 with Enduroliner™ External Coating
M.W. Watermark – Slant Plate Clarifier Series – SPC-150 with Enduroliner™ External Coating

Visit the M.W. Watermark website to view the full specifications of each clarifier in our SPC product line.

Contact our Sales and Service Team for a quote or to learn more.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2021 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.