Gerolsteiner brand of bottled water is categorized as a mineral water, because it receives several essential minerals as it makes its way to its final destination in an underground spring. The journey the water makes takes it through several layers of volcanic rock, which enhance it with calcium, bicarbonate and magnesium. The water eventually gathers in an underground aquifer located 200 meters beneath the surface of the ground. The natural aquifer helps the water maintain its purity by protecting it from airborne pollutants. The Gerolsteiner brand of water begins its journey as precipitation that falls on the western region of Germany. More precisely it falls on an area known as the Volcanic Eifel region. This area is known for its distinctive geological composition, which contributes to the water's clean, refreshing taste, natural pH balance and exceptional purity. The water receives its minerals from a form of limestone it passes through on its way to the underground aquifer.