RO (Reverse Osmosis) reverse osmosis technology is a membrane separation and filtration technology that uses pressure gauge differences as power. It originated from the research of aerospace science and technology in the 1960s in the United States, and then gradually transformed into civilian use. It has been widely used in scientific research, medicine, and Food, beverage, desalination and other fields.

RO reverse osmosis membrane has a pore size as small as nanometers (1 nanometer = 10-9 meters). Under a certain pressure, H2O molecules can pass through the RO membrane, while the source water contains inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses, etc. Impurities cannot pass through the RO membrane, so that pure water that is permeable and concentrated water that is impermeable are strictly distinguished.

The conductivity of ordinary tap water after RO membrane filtration is 5μs/cm (the effluent conductivity after RO membrane filtration = the inlet water conductivity × the salt removal rate. Generally, the salt rejection rate of imported reverse osmosis membranes can reach more than 99%, and it will run within 5 years. It can guarantee more than 97%. For those with relatively high requirements for effluent conductivity, level 2 reverse osmosis can be used, and after simple treatment, the water conductivity is less than 1μs/cm), which meets the third-level water standard of the national laboratory. After circulating and filtering through an atomic-grade ion exchange column, the effluent resistivity can reach 18.2M.cm, which exceeds the national laboratory water standard.

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