What makes Gerolsteiner Mineral Water so special?

All mineral waters differ from each other. The degree and type of mineralization of every mineral water depends on the composition and layers of rock that the water has percolated through. Germany’s most popular mineral water comes from a source in Western Germany: the Volcanic Eifel region, which boasts a unique geological profile. Deep underground, as precipitation seeps down from the earth’s surface, it absorbs the carbonic acid present due to ancient volcanic activity. This water then passes through layers of dolomite, a limestone rock which contains calcium and magnesium – this geology is specific to the Gerolstein region. The carbonic acid dissolves valuable calcium and magnesium from the otherwise almost insoluble dolomite – this is how mineral water of an exceptional quality is created.

Cross-section of rock showing how rain seeps down through earth's crust

Geology of water sources

Illustration of surface water and deep aquifer

Roman naturalist “Pliny the Elder” (23-79 AD) already recognised that “waters are exactly the same as the ground through which they flow”. Every mineral water is a mirror image of the region and its geological conditions.

Mineral waters, which naturally contain calcium, come from limestone. On the way through the limestone, the mineral water also becomes enriched with bicarbonate. However, if mineral water has gone through layers of rock containing gypsum, it absorbs sulphate. By flowing through underground salt deposits from primordial oceans, it is enriched with chloride and sodium.

In regions with a volcanic heritage, such as the Volcanic Eifel, mineral water with natural carbonic acid is created. The carbonic acid facilitates the process of dissolving minerals from the surrounding rock. Ancient volcanic activity can also result in underground rock fractures, which in turn increases the mineralization of the passing water. As the water flows along the subterranean fractured rock surfaces, there is a higher degree of mineralization. This natural wonder takes place over decades.

How Gerolsteiner Mineral Water is created

Green hills and forests in the Volcanic Eifel countryside at dawn

Gerolsteiner mineral water owes its special characteristics to its origins in the Volcanic Eifel. In the Gerolstein syncline, carbonic acid of volcanic origin far underground comes into contact with dolomite, a limestone containing calcium and magnesium. It is the carbonic acid that enables the water to dissolve and assimilate valuable minerals from the rock. Hence, Gerolsteiner Sparkling Mineral Water is naturally highly mineralized, containing specifically calcium, magnesium and bicarbonate. The balanced nature of all the minerals in Gerolsteiner gives it a clean and refreshingly natural taste, rather than a distinct salty, sour or bitter taste as found in other mineral waters.

From the depths of the Volcanic Eifel

In contrast to conventional drinking water, most of which is obtained from ground and surface water and is chemically treated and sanitised, Gerolsteiner comes from up to 250 meters deep below the earth’s surface. Filtered through layers of dolomite rock in the Volcanic Eifel, the water collects there, drop by drop, in natural aquifers that are protected from external influences. Here, it stays fresh and clean thanks to the natural carbonic acid, until finally it is unearthed and bottled directly at its source Gerolstein – pure and unaltered.

Each water individual source is carefully and rigorously monitored to check the water level, temperature, mineralisation and pristine quality. Learn more about the faultless quality of Gerolsteiner here.