Choosing the Right De-watering Box Filter Media

There are many choices for the filter media in your de-watering box. Cloth filters come on a roll that can be any width and are usually 50 yards, 100 yards or 250 yards in length. The filter cloth is typically cut by hand and laid on top of the wire screen in the bottom of the box.  The wire screen can be any mesh size but is usually in the range of is 20 to 100 mesh stainless steel. The wire screen wire can be used by itself or used to support the filter cloth. The most popular filter cloths for de-watering sludge in a de-watering box are made of either Poly Ethylene or Rayon.

Micron measurements are no longer used in specifying filter cloths. Today filter media is specified by weight of the paper. For example, a 1.0 Rayon Filter cloth means that one square yard piece of filter cloth weighs 1.0 ounce. Since most De-watering boxes use gravity to separate the water, filter weights above 1.5 ounces are too thick to drain well. The most popular filter media is a 1.0 Rayon. It is porous enough to let the water drain by gravity and strong enough to not tear.

If you are not sure what to use, call us and we will send you a sample kit. The sample kit will have six pieces of filter cloth, a 0.5, 1.0 and 1.25 in Poly Ethylene and in Rayon. Get a clear fruit jar and a rubber band and your all set to do your own testing.