Sewage sludge, such as metal hydroxides, alum mud, etc .; they are pumped to the Press Filter chambers. water equipmentFiltering passes through a filtering mesh and the solids are retained. The solids accumulate in the mesh forming an excellent filter as if one were to pre-cover the mesh intentionally. While additional solids are pumped into the chamber, the solids continue to accumulate until the entire chamber is filled with dehydrated solids. The press must then be cleaned and recycled.