The pump is made of polypropylene mold, fluororubber seal ring, Ceramic Ball Valve and Teflon Diaphragm. Electromagnetic diaphragm metering pump is a kind of metering pump, metering pump is a special volumetric pump which can measure the fluid being transported. It is generally composed of control part, drive part, drive part and flow part. The difference between electromagnetic diaphragm metering pump and other metering pumps is mainly driven part. The dosage is mainly finished by using the pump of the swimming pool. The dosage is added to the water distribution pipeline of the circulating water treatment of the swimming pool according to the calculated dosage