Abstract: Due to the influence of water hardness, wastewater valve blockage and other factors, the improvement of water efficiency was restricted. In order to further improve the water efficiency of the existing RO water purifier, the softened water technology is applied to the water purifier. Through comparative tests, this technology can reduce the hardness of water, increase the total water purification of the RO water purifier by about 20.6%, and increase the water purification rate by about 15%, so as to effectively improve the water efficiency of the RO water purifier. In addition, the self-cleaning technology of wastewater valve can reduce the risk of valve blockage, reduce the discharge of flushing water and concentrated water, increase the water purification rate by about 5%, and also improve the water efficiency of the RO water purifier.

Key words: Water efficiency of RO water purifier, Softened water technology, Self-cleaning technology of wastewater valve