The filter cartridges utilize calcite media to neutralize low pH conditions and to re-mineralize acidic water that is low in minerals. Calcite is a naturally occurring calcium carbonate mineral that is often used to treat acidic water conditions and is completely safe for use with drinking water. These filters will make water less aggressive by increasing the alkalinity of soft water while improving the overall chemical balance and taste. The resulting treated water will also have higher mineral content which will protect your water appliances and pipes from the damaging effects of corrosion. With this filter, you will be able to enjoy more naturally balanced and alkaline water.