Gerolsteiner Mineral Water consists of waters from areas of previous volcanic activity are especially rich in natural carbonic acid. It develops when magma cools down without the help of the earth"s mantle. The magma pushes its way up and then mixes with water flowing by. Gerolsteiner mineral water contains a lot of very finely dispersed carbonic acid and minerals. The water"s major elements magnesium and calcium make it especially salubrious. The high hydrogen carbonate content gives it its fresh flavor.