First of all, I want to tell you that the shelf life of pure water is 3 to 4 days. That is to say, it will be finished in 4 days after production. No matter what kind of pure water is purified by tap water. Nongfu Spring is no exception. Which is better, bottled water or tap water? The answer is: neither is good. Although boiled water has been heated and disinfected, don't forget that the biggest feature of tap water is disinfection with chlorine. Chlorine gas combines with oxides in water to form tetrachlorocompounds, and heating intensifies their reaction. In other words, the reaction is more thorough. Tetrachloride compounds are serious carcinogens. There are many tiny sediments, rust, bacteria, viruses and so on. Although bottled water has been filtered, there are several bottled water production workshops that meet the hygiene standards! Some saints poured tap water directly into it. Good bottled water is mostly from 30 yuan, but less from 15 yuan. I bought it and drank it for more than half a month, and it has long been broken.