The pure water equipment for coating and electroplating mainly uses reverse osmosis technology to produce pure water; the conductivity of pure water produced by reverse osmosis membrane can reach below 10us / cm. Reverse osmosis technology is the most advanced and energy-saving membrane separation technology. The principle is to separate other substances from water according to the fact that they can not pass through the semipermeable membrane under the action of higher osmotic pressure of solution. Because the pore diameter of RO membrane is very small, the desalination rate of water production can reach about 99%. Therefore, it can effectively remove dissolved salts, colloids, microorganisms, organics and so on. Reverse osmosis pure water equipment has the advantages of good water quality, low energy consumption, no pollution, simple process and simple operation. At present, it is widely used in the production process of industrial pure water. In the coating surface treatment industry of electroplating equipment, according to the requirements of electroplating process, in order to increase the surface finish, brightness, adhesion, etc. of the plated parts, the preparation of electroplating solution needs pure water with the water production conductivity below 15US / cm. In the electroplating process, pure electroplating water with a conductivity of less than 10us / cm should also be used for rinsing. In the electroplating industry, the pure water system is mainly used for the preparation of electroplating solution before electroplating and for the rinsing of electroplating parts. In addition, for the recovery of rare metals in the wastewater after electroplating and rinsing, the rinsing water recycling uses the electroplating wastewater treatment zero discharge system.