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Why it is impossible to boil water twice?

 Water is a life source, making 80 percent of our organism , therefore to its quality should be applied the most strict requirements. Unfortunately, that water which at home arrives through waterpipe system, contains not only the useful properties, but also incorporates chlorine elements, various heavy connections and harmful impurity with which even modern filters not always consult. One of the basic ways of disinfecting and improvement of quality of consumed water was and remains the boil  at which plural bacteria are killed, the chlorine maintenance decreases, water becomes softer. But …. Numerous researches of boiled water have shown, that heavy metals do not disappear at such way of processing of water, and some particles of chlorine can come into contact with other elements and turn to very harmful substances. If the same water to boil twice, concentration of such connections dangerous to an organism increases each time, and the share of useful connections of oxygen decreases to a minimum. In other words, water from "live" and useful turns into "dead" and harmful.