Reverse Osmosis Water Filters
Reverse osmosis water filters are very popular and readily available. They can be installed as under-counter models, or even as a whole house water filter. Originally invented to clean salt water, reverse osmosis works by using water pressure to force water through a membrane, allowing only molecules that are small enough to pass through, thus blocking contaminants. Sediments such as iron, lead, mercury and copper are easily blocked, as are bacteria and viruses. Chlorine molecules also cannot pass through the membrane.
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