A process called “reverse osmosis” is a common method used to clean water. Regular osmosis is when water (by its nature) will gravitate towards a more dense solution if a semi-impermeable membrane is between them. Chemists call it a solvent (the water) moving towards a more highly solute solution (i.e. salty water). To make osmosis function in reverse, you must apply pressure to the salty water, so that the regular water (the solvent) passes out of it through that membrane. Hence, you have cleaned water. It takes a lot of pressure and happens slowly, but it will happen.
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