Reverse osmosis (RO) is a kind of membrane separation technology driven by pressure with the help of selective permeable (semi permeable) membrane. When the pressure in the system is greater than the osmotic pressure of the influent solution, water molecules continuously pass through the membrane and flow into the central pipe through the water producing channel, and then the impurities in the effluent, such as ions, organics, bacteria, viruses, etc., are trapped in the influent side of the membrane And then it flows out at the outlet end of the concentrated water, so as to achieve the purpose of separation and purification.