On the 16th World Water Day, the United Nations set the theme of World Water Day 2008 as "Water Hygiene". According to the Provincial Water Conservancy Department experts, there are five kinds of water in a certain degree will form ************** and other toxic and harmful substances, will have a certain harm to the human body, so people should pay attention to.



Aging water: commonly known as "stagnant water", that is, long-term storage of water. Drinking this kind of water regularly will slow down the metabolism of cells and affect the growth and development of the body for minors, accelerate the aging of the middle-aged and old people, and increase the incidence of esophageal cancer and gastric cancer in many places, which may be related to long-term drinking of aged water, according to medical researchers. The data showed that the toxic substances in aging water also increased with the increase of water storage time.



Boiling water: water that boils overnight or for a long time on the stove, and water that boils repeatedly in an electric water heater. This water has been boiled for a long time, and the heavy metals and calcium and magnesium in water are very high. Drinking this kind of water for a long time will interfere with people's gastrointestinal function, temporary diarrhea, abdominal distention; toxic ********** will also cause anoxia, severe coma, convulsions, and even death.



Steaming pot water: Steaming pot water is steaming steamed bread and other leftover pot water, especially after repeated use of steaming pot water, ************** concentration is very high. Drinking or cooking porridge with this kind of water can cause ************ poisoning; dirt often enters the body with water, and can cause digestive, neurological, urinary and hematopoietic diseases, and even premature senility.



Boiling water: tap water that people drink is treated by chlorination and sterilization. Thirteen harmful substances can be separated from chlorine treated water, among which **** hydrocarbons and ****** have carcinogenic and teratogenic effects. Drinking unboiled water increases the risk of bladder cancer and rectal cancer by 21% to 38%. When the water temperature reaches 100 degrees Celsius, these two harmful substances will be greatly reduced with the vapor evaporation, if continue to boil for 3 minutes, then drinking safety.



Reboiled water: Some people are accustomed to re-boiling the remaining warm boiling water in the thermos flask to save water, coal (gas) and time. But this kind of "saving" is not enough. Because the water burns and burns, so that the water evaporates again, the content of ************ will rise, often drinking this water, the ************ will accumulate in the body, causing poisoning.