How to Know When to Replace Your Filter Cloths

If you’re in a business where part of your industrial process involves separating solids and liquids, you’re most likely familiar with the filter press.

Filter cloths are a necessary component of the filter press. They form the first contact point with the particulate matter in the unfiltered slurry. Once the first particles make contact with the fabric, however, the majority of the filtration is provided by the accumulation of captured particles themselves, which form a “cake” in the chamber.

M.W. Watermark Filter Cloths

The porosity of the filter cloth weave is critical to the filtration process. Understanding that it is the material’s permeability that allows for the filter press to function will go a long way towards understanding when (and why) you need to maintain or replace it.

Different filter cloths are made of different material, and both the type and weave of the sheet will determine how it performs. A monofilament fiber is an indivisible strand of usually synthetic material whereas a “spun” or multifilament textile consists of many strands twisted together, as with a length of rope.

Monofilament cloth is easier to clean because of its low particle retention, and a pressure washer set to no more than 1,000 psi and using a fan pattern can work well.

Spun fabric provides for a higher particle retention rate. However, the higher retention rate means that this fabric may be more prone to fouling.

There are also hybrids that are woven out of a blend of both fibers. Many operations prefer this combination as the best of both worlds.

M.W. Watermark - How to Know When to Replace Your Filter Cloths - A Solid Filter Cake Means Your Filter Press is Operating at Peak Efficiency
A Solid Cake Means Your Filter Press is Operating at Peak Efficiency

Filter cloths need replacement when your filter press is no longer forming a solid cake.

To know when your filter cloths need replacement, pay attention to your machine’s output. If you see low pressure despite cleaning, then it is likely that the permeability is too low. After many uses, the particles get lodged so deep in the fabric that neither cleaning nor even chemical washing is worth the time.

If you see impurities in the output and insufficient caking, then your fabric is likely too porous as a result of stretching or warping in the weave, and you should begin to look for a replacement. Remember, because you put these parts through the ringer, they’ll need replacing from time to time.

Visit the M.W. Watermark Filter Cloths webpage to learn more.

Contact a member of our Sales & Service team to discuss your filter cloths requirements.

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.

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How to Know When to Replace Your Filter Cloths