The filter is an indispensable device on the conveying medium pipeline. It is usually installed in the inlet end equipment of pressure reducing valve, pressure relief valve, fixed water level valve and other equipment of Fanggong Filter. The filter is composed of a cylinder, a stainless steel screen, a sewage part, a transmission device and an electrical control part. After the water to be treated passes through the filter cartridge of the filter mesh, its impurities are blocked. When it is necessary to clean, just remove the detachable filter cartridge and reload it after treatment. Therefore, it is extremely convenient to use and maintain.