... kind of "physical - chemical" process, the water through granular materials when isolated filter water impurities and colloidal suspensions. Filter is an ... the resin layer, the water of the Ca2 +, Mg2 + was exchanged resin adsorption, and other objects at the same time ... system Using reverse osmosis technology for desalination, reverse osmosis membrane was only 0.001 micron pore size, can be harmful to ...