Limescale

Limescale is a hard, chalky deposit, consisting mainly of calcium carbonate (CaCO3). It often builds up inside kettles, boilers, and pipework, especially those used for hot water. It is also often found as a similar deposit on the inner surfaces of old pipes and other surfaces where hard water has flowed.

Limescale also forms as travertine or tufa in hard water springs.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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