Reverse Osmosis
Reverse Osmosis is a process in which dissolved inorganic solids (such as salts) are removed from a solution (such as water). This is accomplished by household water pressure pushing the tap water through a semi permeable membrane. The membrane (which is about as thick as cellophane) allows only the water to pass through, not the impurities or contaminates. These impurities and contaminates are flushed down the drain.
Membrane filtration has become very popular for water purification applications due to its ability to remove both suspended and dissolved impurities without the need for regenerant chemicals.
A reverse osmosis membrane will remove impurities and particles larger than .001 microns.
Advantages of Reverse Osmosis-