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Reverse Osmosis

A reverse osmosis (RO) unit is effective in removing a variety of health contaminants, such as nitrites, calcium, arsenic, asbestos, pesticides, lead, mercury and radium. RO units are upto 95% effective. Unfortunately, reverse osmosis also removes some beneficial chemicals. Typically, an RO unit is used to treat brackish water for drinking & cooking purposes. An RO system usually includes:

  1. A prefilter to remove sediment.
  2. An activated carbon filter to remove volatile chemicals, improve odor and taste.
  3. A semi-permeable membrane through which water flows under pressure.
  4. A tank to hold treated water.
  5. A drain connection for discharging concentrated contaminants.

A typical reverse osmosis water purification unit

A reverse osmosis unit is relatively expensive. Then there are high maintenance costs, because the RO membrane needs replacing according to the manufacturer’s schedule. It also contains moving parts, like the special pump to provide the required water pressure.

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