Everyone has an opinion, like a hole in a nose. On the Internet, you can stumble upon such an interesting "opinion" that boiling the same water in a kettle is not very useful. All allegedly due to the fact that substances that should not be eaten begin to appear in the water boiled several times. Is this really so and what actually happens to H2O with repeated re-boiling?
During the day, people can boil the same water more than once or not twice. We all brew tea and coffee, and also warm a variety of soups and broths. And here it is time to ask: is it not harmful to health? On the Internet, there is an "interesting" opinion that repeated boiling of water is the reason for the appearance of carcinogens in it. There is only one thing to say here. If there were no questionable substances in the water or soup right away, then due to boiling they definitely will not appear in them. Anyway, if you are not trying to make tea using ultraviolet rays ...
The only thing that really changes when boiling water (in addition to its temperature and state of aggregation) is its hardness. Water hardness is divided into temporary and permanent. The constant is formed due to the content of various impurities in the water, primarily salts and metals. It may be excessive, but the water entering the house through the plumbing has already passed a sufficient degree of chemical and physical filtration in order to at least for this point fully comply with the requirements of sanitary standards and be safe for humans. Constant hardness cannot be influenced by boiling.
Temporary rigidity is another matter. It is formed due to the ingress of carbonates and bicarbonates of potassium and magnesium into the water. In general, they are harmless to humans. At the same time, a person can easily reduce temporary stiffness by lowering the dissolved volume of the listed substances in water. To do this, the water must be boiled, after which potassium and magnesium will precipitate, forming the very scale that settles on the walls of the dishes.
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Thus, just as you cannot spoil porridge with oil, you cannot spoil water by boiling. So you can boil water as many times as you like, including in a row. One more horror story must be mentioned separately. Allegedly, when boiled in water, a terrible substance "deuterium" is formed, which accelerates aging. Deuterium is harmless to humans, as it is just an isotope of hydrogen. There is so little of it in boiled water that it cannot affect the body in any way.
If you want to know even more interesting things, then you should definitely read about 7 ways to remove carbon deposits from a saucepanso that it shines like before.
A source: https://novate.ru/blogs/190221/57917/
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