Kusters Water / WasteTech offers a complete line of rotary drum thickeners for sludge thickening. As the drum rotates, fluids pass through the perforations in the drum and fall into the water collection trough underneath the drum and are then discharged. Solids are retained and thickened within the drum and dewatered as they move to the elevated end of the drum by the internal screw auger. Kusters Waterwww.kusterswater.com