In the electroplating coating industry, in order to increase the surface finish, brightness and adhesion of the plating parts, pure water with conductivity below 15US / cm is needed for the preparation of the plating solution. In addition, pure water with conductivity below 10us / cm is also needed for the rinsing of the plating parts. Electroplating coating reverse osmosis equipment is mainly used for the preparation of pure water for electroplating coating. Usually, the system is composed of pretreatment system, ultrafiltration device, reverse osmosis device, EDI device, etc. to meet the requirements of electroplating industry for water quality.