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Electroplating coating industry, in order to increase the plating surface finish, brightness, adhesion, the preparation of the plating solution requires the conductivity of water in the following 15uS / cm, the other in plating rinsing also need conductivity 10uS / cm The following pure water to clean, plating industry water treatment system, including the preparation of the plating bath before plating need pure water treatment system, electroplating rinse wastewater rare metal recycling rinse water recycling wastewater zero discharge system. The system is usually composed of ultrafiltration unit, reverse osmosis unit, ion exchange unit, EDI unit, etc. to meet the electroplating industry's water quality requirements. EDI is a new type of water treatment that combines electrodialysis (the phenomenon of charged solute particles moving through a membrane under electric field induced action) with ion exchange to manipulate electrodialysis (charged particles of the solute in the solution under electric field through a membrane And the scene of migration) of the polarized scene of the ion exchange resin (chemical method polymer particles of inorganic polymer particles made of ion exchange agent) (chemically synthesized polymer made of inorganic monomers Particle ion exchangers) (also known as ion exchangers) End of electrochemical continuous regeneration, without acid-base, more suitable for ancient environmental requirements, exchangeable ion exchange mixed bed, the system of ultrapure water.