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How reverse osmosis works

Reverse Osmosis, also known as hyperfiltration, is the finest filtration available today. It is the most common treatment technology used by premium bottled water companies. It is effective in eliminating or substantially reducing a very wide array of contaminants, and of all the technologies used to treat drinking water in residential and industrial applications, it has the greatest range of contaminant removal. Reverse Osmosis will allow the removal of particles as small as individual ions. The pores in a Reverse Osmosis membrane are approximately 0.0005 micron in size (bacteria are 0.2 to 1 micron & viruses are 0.02 to 0.4 microns). There are two types of Reverse Osmosis membranes commonly used in home water purification products: Thin Film Composite (TFC) and Cellulose Triacetate (CTA). TFC membranes have considerably higher rejection rates (they will filter out more contaminants) than a CTA membrane, however, they are more susceptible to degradation by chlorine. This is one of the reasons why True Water Reverse Osmosis Systems include a high quality activated carbon pre-filter.

Reverse Osmosis uses a membrane that is semi-permeable, allowing pure water to pass through it, while rejecting the contaminants that are too large to pass through the tiny pores in the membrane. Our quality Reverse Osmosis systems use a process known as crossflow to allow the membrane to continually clean itself, as some of the fluid passes through the membrane the rest continues downstream, sweeping the rejected contaminants away from the membrane and down the drain.

Reverse Osmosis successfully treats water with dissolved minerals and metals such as aluminum, arsenic, barium, cadmium, chloride, chromium, copper, fluoride, magnesium, iron, lead, manganese, mercury, nitrate, selenium, silver, sulfate, and zinc. Reverse Osmosis is also very effective with removing asbestos, many taste, color and odor-producing chemicals, particulates, total dissolved solids, turbidity and radium. When using appropriate activated carbon pre-filtering (Included in all True Water’s Reverse Osmosis Systems), additional treatment can also be provided for such "volatile" contaminants (VOCs) as benzene, MTBE, trichloroethylene, trihalomethanes, and radon. Reverse Osmosis is also capable of rejecting bacteria, salts, sugars, proteins, particles, dyes, heavy metals, chlorine and related by-products, and other contaminants that have a molecular weight of greater than 150-250 daltons

Contaminant % Contaminant %
Sodium 85.93 Aluminium 96.99
Lead 96.99 Arsenic 94.99
Mercury 96.99 Sulfate 96.99
Calcium 96.98 Phosphate 96.99
Cromium 96.99 Iron 95.99
Magnesium 96.98 Chloride 87.93
Nitrate 60.92 Sillcate 85.90
Cyanide 86.92 Sulphite 98.99
Bacteria 99.99 Potasium 87.95
Fluride 87.95 Nickel 98.99
Silver 93.98 Bicarbonate 90.98
Manganese 95.98 Ammonium 86.92
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