The main component of this white scale is carbonate. The reason why a layer of white scale is formed is that the content of calcium ions and magnesium ions in tap water is too high, that is, the hardness of water is too high. The source of tap water is generally taken from natural water, which contains a lot of natural minerals and many ionic substances. Under the action of high temperature, calcium and magnesium ions combine with hydroxyl ions in water to form white precipitates, which are chemically called magnesium carbonate and calcium carbonate.