A Filter Press Is a Depth Filter: The Role of Filter Cloths and Cake in the Dewatering Process

Depth filters are innovative pieces of technology that allow particles to collect throughout the medium, not just on the surface. The filter cloth is an integral part of the filter press, collecting particles to separate solids from liquids.

What Sets Depth Filters Apart?

A depth filter, as the name suggests, collects particles throughout the filter medium instead of just on the surface. The unique, porous filtration medium efficiently removes particles from liquids. These filters can also provide filtration to a slurry that contains a higher than normal load of particles without degrading in its quality or letting particles through. Depth filters have a number of sizes and purposes and can be used in potable water treatment, wastewater treatments plants, and more.

M.W. Watermark - A Filter Press is a Depth Filter: The Role of Filter Cloths and Cake in the Dewatering Process

Cake Formation is a Unique Benefit of a Filter Press

Simply put, cake formation is not possible in other types of filters. At the beginning of each filtration cycle, the filter cloth is the primary separator of solids from the liquid stream. Then, as solids build up on both sides of each filter press chamber, the solids become the primary separator, and a “depth filter” is formed in each chamber. This allows for the separation of particles much smaller than the openings in the filter cloth.

As this trapping intensifies, the finer particles become solid throughout the filter plate chamber, like partially hardened mud. This is referred to as the “filter cake” and is often described as a “slab of fudge” as this summarizes its ideal consistency.

M.W. Watermark: A piece of filter cake from a filter press, described as a "slab of fudge"
A piece of filter cake from a filter press, described as a “slab of fudge”

How Do You Know It’s Working?

When the chambers of the filter press are full, the fill cycle is complete. Throughout the fill cycle, the liquid exits the filter plate pack through the corner ports in the manifold, plumbed to exit through a single point. At the end of the cycle, if the filter cake is less than solid, then the cloth may have become clogged. While installing or changing a filter cloth is not the easiest of jobs, M.W. Watermark technicians can perform this task swiftly at a low price, resulting in minimal downtime.

For more detailed information about how a filter press works, visit our Filter Press 101 blog posting.

Contact an M.W. Watermark Sales & Service Team member to discuss your particular application.

M.W. Watermark - A filter press serves as a depth filter

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.

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.

A Filter Press Is a Depth Filter: The Role of Filter Cloths and Cake in the Dewatering Process

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