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The Reverse Osmosis process uses a semi-permeable membrane to separate and remove dissolved solids, organics, pyroxene, submicron colloidal matter, viruses, and bacteria from water. The process is called "reverse" osmosis since it requires pressure to force pure water across a membrane, leaving the impurities behind. Reverse Osmosis is capable of removing 95%-99% of the total dissolved solids (TDS) and 99% of all bacteria, thus providing safe, pure water.

The process of reverse osmosis removes dissolved salts as well as organics. The process can be explained as the raw water I flown through the membrane by applying pressure, in the process a small percentage of the feed water permeates the membrane, the balance portion of water moves alongside the membrane without being filtered and moves out of the system. The stream which permeates through the membrane is the permeate, the second stream of water is called the concentrate because it carries the concentrated salts and other contaminants which are not able to permeate through or rejected through the membrane. Since the two streams of liquid flow side by side to each other this process is also called cross flow filtration process.