Reverse osmosis technology is used for desalination treatment. The pore size of the reverse osmosis membrane is only 0.0001 microns, which can remove harmful soluble solids, bacteria, and viruses. Security filter, high-pressure pump and reverse osmosis membrane. The security filter is the above-mentioned fourth-stage pretreatment system. The high-pressure pump is one of the core equipment on the host, which provides sufficient pressure for the reverse osmosis membrane element to overcome the osmotic pressure and The running resistance meets the rated water output of the device.