Scientists Say You Can't Boil Water Twice. If you boil water a second time, the oxygen contained in it decreases and harmful substances begin to accumulate..

Experts said that many people mistakenly believe that if you boil water twice, it will become even cleaner, even more sterile.. However, it is not. According to scientists, when a person boils the same water several times, the oxygen content in it decreases and harmful substances accumulate..

Scientists have noted the veracity of the concept that bacteria die when boiled. But if you boil water several times in a row, its chemical structure eventually changes and dangerous gases and toxic substances such as arsenic, nitrates and fluorine compounds appear..

And the harmful effects of fluoride compounds on the nervous system and brain have already been identified in numerous studies..

In addition, scientists note that the water contains various minerals.. They do not go anywhere and in the process of evaporation they only concentrate more and more and settle on the walls of the kettle in the form of a hard crust.. If you regularly drink these concentrated solutions of minerals, such as calcium, you can get kidney stones..

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