At present, the commonly used four water filtration techniques: microfiltration, ultrafiltration, nanofiltration, reverse osmosis 1, microfiltration (MF): filtering accuracy is generally 0.1 to 50 microns, like the common variety of PP filter, ceramic filter microfiltration belong to the category, for simple coarse filter, filter sediment, rust and other large particulate impurities, can not remove bacteria, viruses, organic matter, heavy metals and other hazardous substances in the water. Usually can not clean, disposable filter material, require frequent replacement. 2, ultrafiltration (UF): 0.001 to 0.1 micron filtration precision, twenty-first century in the West as one of the most high-tech development. Is a use of pressure membrane separation technology can filter out the rust in water, sediment, colloids, bacteria, viruses, organic molecules and other harmful substances, and can retain some of the mineral elements beneficial to human body. Mineral water, mountain spring water in the core components of the production process. Ultrafiltration process water recovery up to 95%. And can easily achieve positive flush and backwash, clog, relatively long life. 3, sodium filtration (NF): filtering accuracy between reverse osmosis and ultrafiltration, reverse osmosis desalination rate than low, is also a need to add power, pressurized membrane separation technology, water recovery rate is low. Usually used for industrial pure water. 4, reverse osmosis (RO): filtration accuracy of about 0.0001 microns, are separated in the early 1960s the United States developed an ultra-high-precision differential pressure using membrane technology. Water can filter out almost all impurities (including harmful and beneficial), only allows water molecules to pass through. Generally used for drinking water, industrial ultra-pure water, ultra-pure water for pharmaceutical manufacturing. Reverse osmosis technology required pressure, power, low utilization of water.
