http://ifcus.org/2008/05/01/small-can-be-mighty/ Unlike mechanical filters, reverse osmosis filtration is a separation process. By forcing 
untreated water through a semi-permeable membrane, the reverse osmosis process results in the removal of up to 99.9% of undesirable water contaminants. Pressure forces the water to flow in the reverse direction to the direction of flow in natural osmosis separating pure water from contaminants. The reverse osmosis filtration requires a hook up to the water line and a hook up to the drain line in order to drain contaminated water.
When you purchase a residential or commercial reverse osmosis system from H2O4U, you get more than 60 years of industry experience backing our work and products. When you rent from us, you can enjoy high quality drinking water for pennies per day, and any maintenance is performed by our highly trained service technicians.
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