The specific time it takes to open depends on the amount of water, temperature, air pressure, size of the fire, etc. In low altitude areas, it usually takes 5 to 10 minutes for water to boil. At high altitudes, it only takes about 3 minutes.

In low altitude areas, it takes 5 to 10 minutes for the water to boil. At high altitudes, it only takes about 3 minutes. The specific time it takes to open depends on the amount of water, temperature, air pressure, size of the fire, etc.

Water hardness, namely water alkali and scale, refers to all carbonates such as calcium, magnesium, iron, aluminum, manganese, as well as bicarbonate, chloride, sulfate and nitrate in the water. Salts and contain harmful substances such as mercury, cadmium, lead, arsenic and so on.

The hardness of drinking water has a certain impact on human health. According to relevant domestic and foreign studies, the higher the hardness of drinking water, the higher the incidence of hypertensive heart disease, coronary heart disease, cerebrovascular disease, kidney stones and other diseases. As the boiling time increases, the hardness of drinking water decreases. If the hardness decreases by 50%, it needs to be boiled for about 10 minutes. Pour boiling water into the cup and leave it for 1 hour. The hardness will drop more with the lid than without the lid. There will be a significant decrease 1 minute after the lid is added, and there will be little change from 1 minute to 1 hour. Therefore, in order to maximize the killing of bacteria and viruses in the water and minimize the hardness and nitrite content of drinking water, it is best to boil water within 5 to 10 minutes.