1. The white precipitate in boiled water is commonly known as "water alkali", which is mainly calcium carbonate and magnesium carbonate. From the perspective of water safety, the hardness of tap water is safe. Do not drink this precipitate directly. Can.

2. The white precipitate in boiling water is composed of calcium carbonate and magnesium carbonate, which reflects the hardness of the water. In northern my country, water precipitation is relatively small, and groundwater is the main drinking water. The deeper the well, the more The higher the mineral content, the more sediment there will be in the boiled water. This kind of water can be drunk after being left to settle for a while. This is also why boiled water in tap water has sediment and can also be drunk.

1. When water is boiled, the bicarbonate in the water begins to decompose, decomposing into calcium carbonate or magnesium carbonate, which precipitates out of the water in the shape of crystal particles to form a white precipitate, which is What we usually call water residue, scale, and water alkali.

2. If there is a lot of white precipitate in the boiling water when it is boiled, you can put a piece of gauze on the mouth of the thermos bottle, use the gauze to preliminarily filter the boiling water, and then let the boiling water stand for 1 hour and gently filter it. Pour out the upper layer of clean water. The white sediment content in this layer of water is low and you can drink it with confidence.

3. Boil water cannot be boiled repeatedly, especially hard water. Boiling it multiple times will concentrate the minerals in the water due to gasification, which will be harmful to health after drinking.