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Reverse osmosis is one of the processes that makes desalination (or removing salt from seawater) possible. Beyond that, reverse osmosis is used for recycling, wastewater treatment, and can even produce energy.
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 valve has a tube that attaches to the inlet side of the RO pre filter. 2  This is the water source for the RO system. 3  Pre-Filter (s): Water from the cold water supply line enters the Reverse Osmosis Pre Filter first.