EDI ultra pure water system is a kind of ultra pure water manufacturing technology which combines ion, ion membrane exchange technology and electron migration technology. The electrodialysis technology is cleverly combined with ion exchange technology, and the charged ions in water are moved by high pressure at both ends of the electrodes, and the ion exchange resin and selective resin membrane are used to accelerate the removal of the ion movement, so as to achieve the purpose of removing positive and negative ions in water. With advanced technology, EDI pure water equipment with simple operation and excellent environmental characteristics, it is the green revolution of pure water equipment technology.