Filter (filter) is an indispensable device on the pipeline for conveying media, usually installed in the pressure reducing valve, pressure relief valve, water level valve, square work filter other equipment at the inlet end of the device. The filter consists of a cylinder, stainless steel screen, drainage part, transmission device and electrical control part. After the water to be treated passes through the cartridge of the filter screen, its impurities are blocked, and when it needs to be cleaned, it is only necessary to take out the removable cartridge and reload it after treatment, therefore, it is extremely convenient to use and maintain.