DWA supplies automatic grit separator to separate grit and water in grit chamber. All materials are made of stainless steel 304 or 316. Screw conveyor to discharge grit to out, is also made of stainless steel, and PLC system is applied to automatic operation and interactive with auxiliary equipment. For the cleaning of sludge, a cleaning air fan system, 0. 7Skw is installed. The system will be consisted of inlet nozzle, settling tank, inclination plate to separate the grit and water well, cleaned water drain, & etc. A water enclosure gland packing inserted to avoid leakage of settled water in the bottom of screw conveyor. Typical diameter and length of screw conveyor is ￠250 x 4500mm.