reverse osmosis

What is Reverse Osmosis ?


Reverse osmosis or hyperfiltration is the finest filtration nowdays. It uses a semi-permeable membrane that allowing pure water to pass through it, and it rejects the contaminants that more large in size than membrane pore.

A process to allow the membrane to continually clean itself, also known as crossflow, is used as quality reverse osmosis system. Some of the fluid passes through the membrane, while the rest continues downstream, sweeping the rejected contaminants away from the membrane and down the drain. Therefore in the reverse osmosis process need high water presssure to force the fluid through the membrane.

Reverse osmosis is the first choise for almost all home water purification needs. It is also the best recommended solution for induvidual on pre-treated water system.

Unfortunately, although reverse osmosis can be very effective in removing bacteria and virus, but it is not recommended to use only reverse osmosis in purification for water that contains biological contaminants. The addition of complementary whole house ultraviolet system, or make a combined reverse osmosis and ultraviolet system for maximum effectiveness and protection against bacteria and viruses should be a consideration for these application.

Since chorine, iron, manganese, hydrogen sulfide and bacteri attack in water can degrade membrane, a sediment pre-filter and an activated carbon pre-filter (and/or post-filter) should be included in reverse osmosis system.

The reverse osmosis systems are generally the best choice for water contaminated with high nitrite levels as might be found in agricultural areas.

Finally, if household water is excessively hard to prevent pre-filter and membrane foulding, water softeners can be used in advance of the reverse osmosis system.