Reverse Osmosis is state-of-the-art water purification technology. It is the same technology used for purification in laboratories, medicine and even converting seawater to drinking water.

How does Reverse Osmosis work?

Reverse Osmosis uses a semi-permeable membrane, that has a pore size of about 10 angstroms (there are 10,000 angstroms measured in one micron, and there are about 40 microns in one hair thickness). Mains water pressure forces water against the membrane where water molecules (H₂O) are small enough to pass through. Other impurities, including virus and bacteria, are flushed out in the self-cleaning process. This self-cleaning feature is unique to Reverse Osmosis, and is very important. It enables as-new consistent performance. This also keeps filter replacement to a minimum. Reverse Osmosis uses no electricity or machinery.

Why is Reverse Osmosis better than common filters?

The substances which are most difficult to remove from water are known as inorganics. The Sierra removes inorganic substances as well as heavy metals and organics, which means the TDS (Total Dissolved Solids) is removed. Ordinary filters cannot remove TDS. Along with removing the widest range of chemicals, virus and bacteria, the Reverse Osmosis self-cleaning process is far superior to the usual filter methods, where the impurities are stored within the filter.

Sierra is an excellent investment in your family's health.

There are various standards of testing done by NSF (National Sanitary Foundation). Only standard 58 is the rigorous test performed on Reverse Osmosis systems, meeting strict guidelines. For example, a carbon filter system is certified for the functions achieved by Carbon filters e.g. Standard 42 or 53. It cannot achieve same results in above test. Bear in mind too, that a unit may not have been tested for all the contaminant reduction claims covered under the standard; only those contaminants for which the manufacturer has requested testing. For a drinking water system to become NSF Certified, it must meet 5 basic requirements, as follows: 1. Contaminant reduction claims are true. 2. The system does not add anything harmful to the water. 3. The system is structurally sound. 4. The advertising, literature and labelling are not misleading. 5. The materials and manufacturing process used do not change (after receiving the approval). Click for more info re: NSF Approval

Sierra Gives Best Results

This chart shows the percentage of various substances which are removed by the Sierra's unique Reverse Osmosis operation. These results were tested and certified by NSF International. The American EPA also lists all of the above substances as having potential health effects.