Limescale is caused by a build-up of calcium and magnesium minerals in hard water. This hard water is formed when rainwater filters through rocks like chalk and limescale, picking up hard minerals along the way. ... You can check if your area has hard water through our postcode tool.

How is limescale created?

Limescale is caused by calcium and magnesium being left behind when hard water evaporates. ... When it evaporates from a surface, it leaves behind calcium and magnesium deposits. If you live in a hard water area you will have more issues with limescale build up than if you were living in a soft water area.

What is limescale made of?

Limescale is a substance mainly made up of calcium and magnesium which is left behind when hard water evaporates. It produces a hard, chalky deposit and builds up where water is heated or left standing.