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Reverse osmosis (RO) is a water purification technology that uses a semi-permeable membrane. This membrane removes particles from drinking water. Reverse osmosis can remove many types of molecules, ions and bacteria from solutions.
These systems use household water pressure pushing the tap water through the 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.
It must be noted that the reverse osmosis systems remove virtually everything including bacteria, chlorine, fluoride, heavy metals, organic compounds (eg oestrogen), viruses AND beneficial trace compounds and elements.
How the Reverse Osmosis System Works
The Reverse Osmosis Water Filter System has 3 filters before the membrane. The first filter is a prefilter to remove the large particles down to 5 microns such as silt, dirt and rust. The next filter is a granulated activated carbon filter that will remove chlorine and organic compounds such as pesticides, herbicides and oestrogens. The third filter is another prefilter that will remove particles down to 1 micron. This ensures that the water reaching the membrane is as clean as possible. The water is then forced through the membrane either by mains pressure or with the assistance of a pump. The water is then stored in a pressure tank with a flexible liner. When the tap is turned on the water is forced out of the tank and through a secondary carbon filter that removes any residues from the pressure tank. There is also the option of having a remineralizing filter that will restore some of the minerals that have been removed by the membrane. The water is then delivered through the tap.
Pumped versus Unpumped
Because the water is forced through a very fine membrane, the water storage tank can take a long time to fill. Unless you have high water pressure or do not use much drinking water we would recommend the pumped version of either the 5 stage or 6 stage units.
Mineralising and Alkalinising Filter
The Pumped and Unpumped 6 stage Reverse Osmosis Systems have a mineralizing filter as the final filter. This filter enriches the purified water with healthy essential minerals, calcium and magnesium. This improves the taste and odour of the purified water.
This filter also raises the pH level of the final drinking water to between 7.2 to 7.3. This is slightly alkaline with neutral pH being 7. The human body strives to have a pH in the region of 7.3 to 7.4
The Healthy House® also offers a range of independently tested undersink drinking water filters