What's the difference between Ro pure water and EDI ultrapure water?

RO pure water usually refers to water made by RO (reverse osmosis) equipment. Its principle is that raw water passes through the reverse osmosis membrane under high pressure, and the solvent in the water diffuses from high concentration to low concentration, so as to achieve the purpose of separation, purification and concentration. Because it permeates in the opposite direction in nature, it is called reverse osmosis. Reverse osmosis water treatment system can remove bacteria, viruses, colloids, organic substances and more than 98% soluble salts in water. This method has the characteristics of low operating cost, simple operation, high degree of automation and stable effluent quality. Compared with other traditional water treatment methods, it has obvious advantages and is widely used in water treatment related industries.

EDI ultra-pure water is to further desalt RO pure water. Under normal circumstances, the water produced by RO will be used as the inlet water of EDI equipment. EDI is a combination of traditional electrodialysis technology and ion exchange technology. Under the action of electric field force, the directional migration of ions in water is realized through the selective penetration of anion-cation membrane and the exchange of ions in water by ion exchange resin, so as to realize the deep purification and desalination of water. Hydrogen ions and hydroxyl ions produced by water electrolysis are constantly regeneration of resin, so EDI module can continuously produce high-quality ultra-pure water without acid-base chemical regeneration. In general, the quality of the produced water can be stabilized at15-18mΩ.cm..

At present, the most widely used EDI brands in the market are Electropure EDI, Siemens and so on.