1. Classification of water:
Distilled water: drinking water obtained by vaporizing water through a specific distillation device, and then collecting it through condensation and liquefaction.
Purified water: the conductivity is about 50～150μs·cm-1, and the bacteria index is the same as that of purified water. Generally, imported nanofiltration membranes are used for treatment, and the salt rejection rate is about 80%. There is no national standard at present, but some local standards have been issued (such as Shanghai).
Health water: According to the development and requirements of the market, natural mint essence, chrysanthemum and tea concentrate are added scientifically on the basis of pure water.
Others: drinking water suitable for the treatment of certain patients, such as alkaline water (pH around 8.5), ionized water (injecting trace elements on the basis of pure water, similar to mineral water, but with higher cost), oxygen-enriched water ( The oxygen content in water is higher than that in general beverages).
Tap water: generally taken from rivers, rivers, lakes, moorings or underground water sources, after dosing, artesian sand filtration, sterilization, then pumped to the pipe network, except for improvements in turbidity, chemical oxygen consumption, bacteria and other indicators, the rest There is basically no change in the indicators.
Purified water: it is the water treated by the primary or secondary reverse osmosis membrane method, and its electrical conductivity is required to be 10μs·cm-1. It has certain requirements for bacterial indicators, chemical oxygen consumption, pH value and other indicators. The GB17323-1998 national standard for pure drinking water has been implemented.
Mineral water: The treatment of mineral water is mainly to remove suspended impurities and organic matter, and to sterilize it. Some mineral water sources need to remove part of their hardness and alkalinity and adjust to a reasonable content.
Mountain spring water: water taken from about 100 meters underground without any pollution. It is generally treated by imported roll ultrafiltration. The biggest advantage of this water is that it not only maintains the nutrients in the water, but also removes impurities such as bacteria and organic matter.
2. What kind of water should I drink?
(1) Mineral water. Real mineral water is good and has a certain health care effect. But some mineral water contains disproportionate minerals, which is not necessarily good. Especially some mineral water is actually artificially added pure water to several minerals
It is difficult to guarantee the natural and normal ratio of material trace elements, and it may still lack some required trace elements. You should choose authentic brand water for drinking.
(2) Pure water (distilled water, space water), all harmful and harmless substances and elements are removed. If pure water is used for drinking and cooking, all trace elements in the water are gone. If things go on like this, it may be potentially harmful. It is used to make tea for drinking to keep the tea taste good, but it is not suitable for more use. Especially the elderly and children are not suitable for long-term drinking.
(3) Tap water filtered again. The tap water treated from the water plant has been monitored for 35 items including bacteria, but the water that passes through the water pipe network and the water tank to the faucet is best used after filtering with a simple and economical activated carbon purifier.
Attention should also be paid to daily water use. Let go of the stagnant water in the pipe overnight in the morning. Drinking water can be used for several hours (but not more than one day). Aging old water stored for more than 3 days, its molecular structure will not be deformed by impact, so it is not suitable for drinking. Boiled water is generally boiled for 3 minutes. Do not boil for too long. It is not good if the water is not boiled or boiled for too long. Water that has been repeatedly boiled and stored in a thermos bottle for several days is not suitable for drinking.
Therefore, experts suggest that from a health point of view, it is generally best to drink warm water below 30°C.
Expert 1: The tap water after chlorination and disinfection contains 13 kinds of halogenated hydrocarbons and other harmful substances, but it is a good way to reduce the harmful substances to a safe range and boil the water. But when the water temperature just reached 100 degrees Celsius, the content of halogenated hydrocarbons and chloroform were 110 micrograms and 99 micrograms per liter, respectively, which exceeded the national standard; and after 3 minutes of boiling, the two substances quickly dropped to each liter. Containing 9.2 micrograms and 8.3 micrograms, within the standard. If the water is boiled continuously, the content of halogenated hydrocarbons and chloroform will decrease, but the quantity of other non-volatile substances in the water will increase, which is also harmful to the human body. Therefore, it is best to boil the water for about 3 minutes.
Expert 2: It is best to boil water for 5 minutes. This period of time can completely eliminate bacteria and bacterial spores.
It can be concluded that the time to boil the water is not as long as possible. It is most suitable for 3 to 5 minutes.
Purified water treated by the water purifier
At present, most of the water purifiers sold on the market use ultraviolet radiation, reverse osmosis, distillation, activated carbon filtration, microporous ceramics, and neutral fiber membrane filtration methods to purify water. In principle, these filtration methods all have certain water purification functions, but it is difficult for one filtration method to have the above five water purifier functions at the same time.
Therefore, only by integrating the strengths of various methods can the water purification function of the water purifier be perfected, and the most popular one on the market is precisely the simplest activated carbon water purifier. This kind of water purifier has a poor effect on removing microorganisms, and the effect is weaker after long-term use. The filtered residue is accumulated in the activated carbon. If the filter element is not replaced, a large number of bacteria will breed, and it will pollute the water again.
It can be concluded that the water purifier market is not yet standardized, and it is necessary to carefully choose a water purifier with a strong brand and reasonable water purification method.
If you want to buy bottled water, it is best to buy natural mineral water, because it is the closest to the above guidelines for healthy water. However, some brands of mineral water, because the water source contains bromide ions, if ozone is used for disinfection in the production process, the bromide ions may react with trace organic matter in the water to form harmful substances such as bromoform under the action of ozone; if not properly The follow-up process may lead to excessive bromoform in this bottled mineral water.
In general: Before buying bottled mineral water, you should not only look at the appearance (such as whether there is sediment, the color of suspended solids, etc.), but also whether the water contains bromide ions. Brand selection is also the key.
Commercially available pure water (including distilled water) mostly uses tap water, and tap water has a certain amount of volatile halogenated hydrocarbons due to chlorination. Volatile halogenated hydrocarbons are carcinogenic and mutagenic.
Pure water, as a kind of artificially softened water, does not contain calcium or magnesium, and the total dissolved solids are also very low. It is slightly acidic. Drinking it is not good for health. Softened pure water without any protective minerals (or desalinated water), the effect of any harmful substances in this soft water will be amplified, and a small amount of harmful substances in soft water will be the same amount as hard water Harmful substances have more harmful and negative effects on our health.
Comprehensive knowledge: Drink pure water daily and eat more fruits and vegetables to supplement the necessary trace elements.
Health Tips-Adults drink 8 glasses of water a day
Human health must pay attention to psychological and physiological balance, and physiological balance includes the body's nutritional balance, acid-base balance, and electrolyte balance. Haoge electrolyzed water has the following characteristics: anti-oxidation, strong dissolving power, weak alkaline and clean and straight-drinking, containing minerals required by the human body, which meets the daily drinking water needs of the human body. Installing an electrolyzed water machine at home is better than buying bottled water A lot of benefits. Among them, it is very important to maintain the body's daily water balance. Generally, the daily intake and consumption of water should be close to the change of human body weight. Therefore, water nutritionists recommend that to ensure the daily water consumption of the human body, each adult should develop the habit of drinking 7-8 glasses of water per day (an average of 300 ml per cup, [Note] ordinary canned drinks are 350 ml).
"Three Attentions" for Drinking Bottled Water
Be careful not to put the bottled water in a place exposed to sunlight. Sunlit barreled water is more likely to produce algae, breed bacteria, and cause the total number of colonies to exceed the standard. Pay attention to strictly prevent counterfeit bottled water, consumers must go to the regular water delivery point to buy bottled water. Note that the bottled water should be used up within a week after opening.