furring scale

Water dissolves have calcium hydrogen carbonate, little also look not to come out. But when the containing carbonated water of calcium hydrogen into the pot, calcium hydrogen carbonate burn when heated, and transform for the original carbon dioxide, water and calcium carbonate. These contain calcium carbonate in the boiled water into the teapot thermos inside, calcium carbonate gradually in-depth bottle or add knot, walls, time grows, calcium carbonate knot on, became "tea scale". Why, then, hydrochloric acid can remove calcium carbonate? This is a chemical reaction, to generate a new substance called calcium chloride. Calcium chloride can dissolved in water, so long as water washed is not. Thus, "tea" would remove scale. using hydrochloric acid except "tea scale". Mark: first, don't directly by hand to wipe, had better use copper wire badgering cloth to swab, secondly, hydrochloric acid to match a little farther apart, can't be too thick, but also cannot too much, because hydrochloric acid corrosive. Remove scale ", "tea to water conscientious to flush several times, can the hydrochloric acid off: Or in the teapot fill some water, put on a few nails, a few days, those remaining hydrochloric acid is not.