Filter Cloth for Filter Presses - M.W. Watermark

Q: How do you select the proper fabric?

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Choosing the correct fabric depends on a number of factors, including your process application, slurry composition, and the type of press you’re using. The weave, fiber type, and finishing treatments all play a role in how efficiently solids are separated from liquids. It’s important to match the material and design to your specific needs. CLICK FOR MORE INFO.

Q: How do I know when to replace the media in my filter press?

If your press is no longer producing a solid cake, or you notice a drop in pressure despite regular cleaning, it might be time for a change. Over time, particles can become deeply embedded in the fabric, reducing permeability to the point where even chemical cleaning won’t help. Likewise, if you’re seeing impurities in the filtrate or the fabric appears stretched or warped, it may be too porous to function effectively. These are strong signs that replacement is needed.

Q: How long will will they last?

Its lifespan varies based on operating conditions. Exposure to harsh chemicals, abrasive slurries, or high cycle counts can all reduce durability. Regular cleaning and routine inspections can help extend performance and avoid unplanned downtime.

To learn more, see HOW TO MAXIMIZE LIFE 

Q: What’s the easiest way to reorder replacements?

M.W. Watermark® understands that when you need replacements, every day that you have to wait is costing you. That’s why we make ordering as easy and streamlined as possible, allowing you to get your operation back up and running quickly, with minimal downtime. For more info see TEMPLATE FORMS MAKE ORDERING  QUICK AND EASY

Q: What are head cloths, intermediate cloths, and tail cloths?

Head Cloth: Usually a single-panel cloth with a center hole, attached to the head filter plate. Other configurations include drape-over and barrel-neck cloths. (Gasketed cloth shown).  

Learn more on how to install the head cloth

Intermediate Cloths: These constitute the majority of the cloths in the filter press and are attached to the intermediate filter plates between the head plate and the tail plate. (Gasketed cloth shown). 

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Tail Cloth: This is the last cloth in the plate stack – a single-panel cloth without a hole, attached to the tail filter plate, may be a drape-over cloth design. (Gasketed cloth shown). 

Q: What does cloth blinding mean?

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

Q: What is the difference between CGR and NG filter plates?

CGR vs. NG

“CGR” is an acronym for “Caulked, Gasketed, Recessed chamber.” CGR plates 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. “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.

Q: How do you install ?

1. Resistance to Mechanical and Chemical Conditions

This would include consideration for the tensile forces acting on the fabric and abrasive nature of the slurry.

2. Resistance to Blinding

This is a well-known filtration industry term which relates to particulate matter becoming trapped within the interstices of the fabric, and leading to a substantial reduction in filter press throughput.

3. Good Cake Discharge at the end of the Filtration Cycle

No doubt you already know that filter cake which stubbornly adheres to the fabric will lead to a reduction in process efficiency. Having to do all sorts of ongoing manual scraping is simply less cost-effective than having a filter cloth that is optimized for good cake discharge, right?

4. Low Cake Moisture Content

This is particularly important where filter cakes need to be transported for landfill. Read our blog for more information about Reducing Expenses for Transporting Filter Cake here.

5. Excellent Press Throughput

Filter cloth selection – along with filter press equipment choices – does play a critical role in achieving the maximum throughput in the minimum time and with minimum resistance.

6. Filtrate Clarity

If there are solids in your filtrate, it is possible that the filter cloths are not ideal for your application or the cloths have holes or tears and are ready for change out. Other factors may relate to proper installation of the head cloth or – if using gasketed cloth and plates – the proper installation of the CGR cloth.

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