These dewatering presses utilize mechanical pressure from hydraulic cylinders to squeeze liquid out of metal hydroxide sludge. The filter bags, housed in the pressing chamber, do not need to be full for the presses to run.

The bags are sandwiched between grooved racks, and can be filled either automatically or with a hand-directed hose. After filling, a hydraulically-driven plate compresses the racks together, squeezing the liquid out. Pressure is applied evenly to every point, providing a uniform cake dryness.

After squeezing is complete, the hydraulic cylinders retract and the pressing module pivots 180 degrees, releasing all of the dry cakes at once. The module then returns to its upright position and is ready to be refilled.