Working principle of reverse osmosis: Reverse osmosis is the most sophisticated membrane liquid separation technology. Operating pressure is applied on the inlet water (concentrated solution) side to overcome the natural osmotic pressure. When the operating pressure higher than the natural osmotic pressure is applied to the concentrated solution side When the water molecules naturally penetrate, the flow direction will be reversed. The water molecules in the incoming water (concentrated solution) pass through the reverse osmosis membrane and become purified water on the dilute solution side; the reverse osmosis equipment can block all soluble salts and molecular weights greater than 100 organic matter, but allows water molecules to pass through, the desalination rate of the reverse osmosis composite membrane is generally greater than 98%.