RO system is used to desalinize, desalination rate can reach 95%－98%，reclaiming rate can reach 25%-40%, output water is safe  favorable for people. Pollutants including lead, copper, arsenic, mercury, magnesium, zinc, cyanide, sulphide, nickel, silver, manganese, barium, chromium,CHCl₃, CCl₄, benzene , pesticide, hydroxybenzene and bacteria are removed.