Ultrafiltration: (UF), also called hollow fiber, is a physical screening process that uses the pore size of ultrafiltration membrane to separate liquid; The pore size is generally 0. 1-0.0 1 micron, which can effectively remove harmful substances in tap water, such as bacteria, colloid, virus and impurities. Because ultrafiltration membrane is physical filtration, it can't filter out chemicals, and it will retain mineral components in water, but it can't filter out heavy metals. Generally speaking, the water purified by ultrafiltration can reach the standard of direct drinking, and it is a widely used water purifier at present.
Nanofiltration: (NF for short) the pore size of the nanofiltration core is between 0.0 1-0.05438+0 micron; Can filter out chemical pollutants such as antibiotics, hormones, pesticides, petroleum, detergents, heavy metals and microcystins; However, mineral ions smaller than this pore size can pass through; Can effectively retain beneficial minerals.
Reverse osmosis: (referred to as RO) uses a special high-pressure water pump to increase the pressure of raw water, so that the raw water can penetrate through the reverse osmosis membrane with a pore size of 0.000 1 micron under the action of pressure. It can remove heavy metals, pesticides, chloroform and other chemical pollutants in water. The effluent of reverse osmosis water purifier is usually pure water, and its PH value is acidic, so long-term drinking is not good for your health.