The core of RO (reverse osmosis) industrial water purifiers is reverse osmosis membrane technology. Its working principle involves forcing raw water through a semi-permeable membrane with pores smaller than 1 nanometer under high pressure (typically 1.5-10.5 MPa). This allows water molecules to pass through while retaining most impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, and viruses, thus achieving highly efficient separation and purification.