The world is in our hands...
Reverse OsmosiAdvanced UV Member of CWEA
Member of ISPE
Filter Cloth Nomenclature (now its as clear as mud!)
There are several different cloths commonly used for filter presses.
Polypropylene Mono/Multifilament Material PMM
Permeability = 5-15 CFM
This cloth performs well in oily, sticky or tacky solutions such as oil sludge. The mono-multifilament weave cloth has dual characteristics. The mono-filament weave (the black shiny side of the cloth) faces the cake side of the filter, giving high release characteristics, while the multi-filament side allowing for tight micron retention. it is quick to clean up and is frequently used when precoat and bodyfeed operations are required.
Polypropylene Multifilament Material PMU
Permeability = 1-5 CFM
This cloth is the most popular cloth for metal hydroxides, and preconditioned or polymerized sludge's. It offers medium cake release characteristics and the high durability of the fabric has made it the standard for most filter press applications and will usually come with a new Filter press unless otherwise specified.
Polypropylene Monfilament Material PSM
Permeability = 100 CFM
This material is used in high flow low clarity applications. Often specified when multifilament cloths blind off such as the laundry industry. To achieve the normally expected filtration results this cloth is often used with in conjunction with filter aids such as diatomaceous earth DE. DE is used as a filter aid in two ways, often called "Precoat" coating the cloth before applying sludge and "Bodyfeed" adding the filter aid in a continuous stream to the sludge fed to a filter.
Fancy Twill Weave FTW
Permeability = 0.5-1.0 CFM
This cloth offers the tightest weave available for commercial filter presses, it has a very high release characteristics. FTW is the most durable of all filter cloths and is generally used in high pressure, high temperature applications
SoCal Water Treatment Systems