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Limescale in drinking water is not harmful, but vital. Rüdiger from the blue-green team explains how limescale forms and why you can still drink tap water without worry. Limescale is calcium carbonate and consists of calcium, carbon and oxygen (CaCO3). It is the fifth most common element on earth and is present in the rock in the soil and reaches the groundwater via the natural water cycle. This in turn is the raw material for our drinking water. Calcium carbonate is crystalline and is found in dissolved form in drinking water. When the water evaporates, crystals form. This is how limescale deposits are formed: small white flakes, for example on the kettle and the tap aerator. Together with magnesium, calcium carbonate is responsible for the hardness of drinking water. In Germany, this is indicated with the "degree of German hardness" - dH for short. Water hardness describes the calcium and magnesium content in tap water. The harder the water, the more minerals it contains. So hard water is healthy! You can find out more about water hardness here: Gelsenwasser website https://www.gelsenwasser.de/wasser/tr... Gelsenwasser blog https://www.gelsenwasser-blog.de/bede... #teamblaugrün #wassernerds #kalk #trinkwasser #leistungswasser #gesundheit #greenliving #calciumc #magnesium #mineralien #wasserhärte