The Reverse osmosis membrane removes not only harmful pollutants but also a few helpful minerals. As a result, a standard 5 stage RO system produces slightly acidic water with a pH of 7. 0 or below. This mineral filter produces alkaline water with restored healthy minerals such as natural calcium, magnesium, and potassium ions, which ph.-balances the RO water Experience clean, safe, and good-tasting water every time you turn on the faucet The Mineral filter can be added to any Ro water filter or RO system. This mineral filter is built with a secure push-fit quick connection, which allows faster filter replacement.