Patent of water purifier.

Penetration is a physical phenomenon. If two kinds of water containing different concentrations of salts are separated by a semi permeable film, it will be found that the water on the side with less salt content will penetrate into the water with high salt content through the film, but the salt content does not penetrate. In this way, the salt concentration on both sides will be gradually integrated until it is equal. This process is called natural infiltration. Reverse osmosis is a pressure driven separation method that separates solute and solvent in solution by means of selective interception of semi permeable membrane.