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Reverse Osmosis Systems

In order to reverse the natural tendencies of water and salt movement and force clean water to flow from salty water, the osmotic pressure must be overcome, i.e. osmosis must be reversed. In order to reverse this flow of water, membrane systems, and reverse osmosis systems in particular, utilize a specially constructed semi-permeable membrane element enclosed inside a pressure vessel. Pressure is applied to reverse the flow of water, the source of which is usually an existing, pressurised line for smaller volumes, or the addition of a pump for larger installations. As pressure is applied to the feed stream, water molecules pass through the membrane while salts are retained in the feed. By using the principles of water and salt movement, and combining them with pressure and membrane technology, the natural osmotic flow is reversed.

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