As the temperature rises, people's drinking water is also increasing, and the rumors about water on the Internet have also increased. To this end, the Anhui Food and Drug Administration has sorted out and rumored the main rumors about water in recent years, and popularized relevant knowledge to prevent rumors from happening again. There are rumors on the Internet that after 3 days of opening the bottled mineral water, the bacteria content is more than that of tap water, which is a typical "dangerous water". In this regard, the Provincial Food and Drug Administration said that after the bottled water was opened, although the water contacted the air for a period of time, although bacteria would be produced, this did not mean that the bottled water could not be drunk. Bacteria can be divided into beneficial bacteria, harmful bacteria and neither beneficial nor harmful bacteria. In the case of ensuring hygiene, only in the extreme cases such as the prevalence of epidemics, the pathogenic bacteria will enter the bottled water of Kaifeng and affect the drinking safety. At other times, the bacteria in the air will not affect the drinking safety of the bottled water. When the WeChat circle of friends spreads and cooks food with the lid, the tap water is heated and the chlorine contained in it is completely coated on the food, and chlorine is carcinogenic. According to this rumor, tap water cannot be used for cooking. Use boiled water or filtered chlorine. In response, the Provincial Food and Drug Administration said that this statement exaggerated the impact of residual chlorine. At present, most of the tap water disinfection in China uses the chlorination method. According to the relevant data of the World Health Organization, the human body has a certain tolerance to chlorine. Assuming that all of the chlorine is from drinking water, the chlorine content in tap water is about 5 mg/L. In China, the residual chlorine content of tap water is 0.05mg/L~4mg/L, and there is not enough evidence to show that chlorine is a carcinogen. More importantly, most of the residual chlorine is decomposed into chloride, chlorate and oxygen when cooking. The first two do not evaporate, the latter does not affect health, so there is absolutely no need to worry about chlorine being "coated on food." WeChat friends circle rumors that pure water is "poor water", does not contain any trace elements, but also lists other harms to the human body by drinking pure water. In this regard, the Provincial Food and Drug Administration said that drinking water is to replenish water, not to supplement trace elements. The main sources of minerals and trace elements in the human body are vegetables, fruits, rice, and meat. The nutrients in the human body will not be "washed out" by water. A 60 kg adult has a body fluid of 36 kg to 42 kg, while an adult's daily drinking water generally does not exceed 2 liters. The calcium ion concentration has little effect.