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Watts Stage 3 Under Sink Reverse Osmosis Water Filter System Watts Stage 3 Under Sink Reverse Osmosis Water Filter System 279.99 USD This 3-stage reverse osmosis system is equipped with a sleek, space saving design. The first stage carbon block filter removes the sediments, chlorine, taste and odor. The second stage is the heart of the reverse osmosis system, the 50 Gallons Per Day reverse osmosis membrane. The thin-film semi-permeable membrane reduces TDS (Total Dissolved Solids), cysts, lead, chromium, cadmium, fluoride, barium, copper, selenium, radium 226/228 and turbidity. The third stage is a Granular Activated Carbon (GAC) filter which is a final water polishing filter.