A dedicated high-pressure pump is used to apply a pressure of 6-20kg/cm ² to the inlet water, allowing the raw water to pass through a reverse osmosis membrane with a pore size of only 0.0001 microns under pressure. Chemical ions, bacteria, fungi, viruses and other impurities cannot pass through the membrane layer and are discharged from the system with concentrated water. Only water molecules with a diameter less than 0.0001 microns are allowed to pass through the membrane layer, thereby achieving the goals of seawater desalination and water quality purification. The conductivity of primary reverse osmosis water is usually ≤ 10 μ S/cm, and the desalination rate of the system is ≥ 99%.