The filter is an indispensable device on the pipeline of the conveying medium. It is usually installed at the inlet side of the pressure reducing valve, pressure relief valve, fixed water level valve, Fanggong filter and other equipment. The filter consists of a cylinder, a stainless steel filter 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 screen, its impurities are blocked. When cleaning is needed, just take the detachable filter cartridge out and reinstall it after treatment. Therefore, it is extremely convenient to use and maintain.