I guess the pure water you bought is fake! Commercially available mineral water and pure water are the most easily counterfeited. Because the standard of tap water in China itself ensures that ordinary people will not affect their health after drinking it for 70 years. Therefore, the profiteers directly poured tap water into bottles or barrels and found a fake trademark to paste. In this way, a ton of tap water of 5 yuan can be easily sold to 1000 yuan. Someone on the internet has calculated that a tap water sample is completely tested according to the national tap water standard, and the testing fee is1.7 ~ 22,000 yuan. Due to the high cost of testing, governments at all levels can only supervise waterworks. There is no way to supervise thousands of bottled water in the market. People who buy water can hardly test it. So it is relatively safe for profiteers to do these bad things. A word of advice, you'd better drink tap water unless you have to!