... China Reverse Osmosis technology is the most advanced and economical membrane separation technology. Solvent in liquor can be separated with ... impurities, and so on. Because the diameter of reverse osmosis membrane is very short(about 10 angstroms), salt, colloid, bacteria, ... kation and anion resin in exchanging pole, using ion-exchange resin to exchange with calcium, magnesium and natrium ions to get ...