Calcite (calcium carbonate, a natural calcium mineral that
is mined for this purpose) or a mixture of calcite and magnesium oxide, is installed into the mineral tank. As acidic (low pH) water flows into the tank head, it is directed down through the distributor tube to the bottom of the tank forcing water to flow “up” through the minerals in the tank.
The minerals dissolve into the water causing a boost in the pH level by effectively increasing the hydroxide ion concentration and decreasing the hydrogen ion concentration in the water.