ion exchanger is to use the exchange and adsorption performance of anion and cation exchange resin to remove various anions and cations in water to achieve the purpose of desalination. Ion exchangers are classified into positive bed, negative bed, and mixed bed according to a single device. In water treatment applications, a variety of combinations of demineralization systems are used to meet the design requirements. Ion exchanger is an essential equipment for the preparation of high-purity water. It is widely used in the fields of medicine, chemical industry, electronics, electroplating, boilers and other fields. The water quality resistivity after combined with reverse osmosis and electrodialysis can reach 1-18M.CM.