Works water hardness mainly by which cations: calcium (Ca), magnesium (Mg) ion composition, resin separation softener technology exchange softening through the water sodium ions, i.e., the raw water through the sodium ion-exchange resin, water, Ca, Mg exchange resin was replaced by Na +, make into a soluble sodium compound is not easy to scale the formation of scale calcium and magnesium compounds. 2RNa + Ca = R2Ca + 2Na + 2RNa + Mg = R2 Mg + 2Na + exchange calcium and magnesium ion resin saturated salt solution after treated can be converted back to the sodium and restore its exchange capacity, the regeneration process of the reaction equation to: R2Ca + 2NaCl = 2RNa + CaCI2 R2Mg + 2NaCl = 2RNa + MgCI2 high degree of process characteristics 1. automation, water conditions and stable 2. efficiency, low consumption, the provincial labor, low operating cost 3. tank pressure, corrosion 4 is widely used, equipment, compact structure, small installation footprint