What is hard water? What is limescale?
Drinking water often contains naturally dissolved minerals such as calcium and magnesium; the quantity of these minerals in the water determines its “hardness”. In the South East of England, drinking water comes from rainfall that has filtered through limestone rock, dissolving the minerals in the process and resulting in hard water. In other areas, the underlying rocks are granite which contain less calcium and magnesium, or the water comes from reservoirs or rivers, and hence the water is softer
Calcium and magnesium are important micronutrients and are required for overall health. However, when hard water is heated, dried or evaporated, the dissolved minerals are deposited, leaving a hard residue called limescale. This builds at an average rate of 1mm/year and a 4-person household can produce up to 70kg of limescale per year.
Around 13 million households (60%) in the UK are supplied with hard or very hard water