Filters are an indispensable device on the pipeline of medium transportation, commonly installed at减压阀(reducing valves),泄压阀(relief valves), and定水位阀(level valves), as well as at the inlet of Fang Gong filters and other equipment. The filter consists of a cylinder, stainless steel filter mesh, drainage section, transmission device, and electrical control section. The water to be treated passes through the filter筒(filter casing) of the filter mesh, where impurities are blocked. When cleaning is needed, simply remove the detachable filter casing, clean it, and reinsert it. Thus, it is convenient for use and maintenance.