Selenium-rich mineral water contains rare "selenium" element, which is the king of anti-cancer, not only can prevent cancer, but also has a good therapeutic effect on common diseases in life; Ordinary mineral water can only quench thirst. Like some common mineral water on the market, some merchants will sell it under the banner that there are minerals in the water, but once tested, they either find that there are no minerals at all, or there are few, and one kind of water is weakly alkaline, but after investigation, these waters are only neutral at best, and there is no need to adjust the acidity of the body at all.