Cloacina designed and built a CEMPAC Sludge Thickening System utilizing SiC Flat Sheet Membranes for the Chelan County Public Utility District No. 1 which was partially funded by the Washington Department of Ecology. The system was a dual-train thickener, with each train consisting of four membrane cassettes. Each train was designed to be individually configurable for the specific feed source, which consists of filter backwash and Waste Activated Sludge (WAS). This system was designed and is currently operating without any polymer injection to achieve the desired results.