Reverse osmosis uses dense ...

Reverse osmosis uses dense membranes that let water through and stop all salts. This technique is used for: Desalination of seawater; Desalination of brackish water; Production of ultra pure water; The production of process water ...
The phenomenon of osmosis is a phenomenon that tends to balance the concentration of solutes on both sides of a semi-permeable membrane. The phenomenon of osmosis is a common natural phenomenon, especially through cell membranes. The semipermeable membrane will let the solvent pass (the solute does not pass) to balance the concentration. The difference in concentration creates a pressure, called osmotic pressure. To reverse the passage of the solvent and increase the concentration difference, apply a pressure higher than the osmotic pressure