Beijing Zhongxin Jiayi Technology Co., Ltd. is a technical company specializing in the production, sales and service of laboratory R&D. In ZX-70 ultra-pure water machine, ion exchange resin exchanges cations with hydrogen ions and anions with hydroxide ions. The cation exchange resin made of styrene and divinylbenzene containing sulfonate will exchange various cations (such as Na+, Ca2+ and Al3+) with hydrogen ions. Similarly, anion exchange resin made of styrene containing quaternary ammonium salt will exchange various anions (such as Cl-) with hydroxide ions. Hydrogen ions released by cation exchange resin combine with hydroxyl ions released by anion exchange resin to generate pure water.