Uncle Wang is 63 years old this year, has been living in the countryside, in recent years he has become older, no longer working in the fields all day and night, and playing chess at the entrance of the village when he has leisure time. Usually living habits are very good, sleep well at night, eat well, but only do not want to drink water, tea is OK, but the usual boiled water can not drink two cups a day.
Three months ago, Uncle Wang got up in the morning to urinate, and he always felt bloated, especially the soreness and distension of the side waist and abdomen, which was very uncomfortable. I thought it was twisting Yangge to my waist, so I put a plaster on it and raised it. After a while, the inner thigh always throbbed unconsciously, which frightened me, and I planned to go to the big hospital in the city to see what the disease was.
When he arrived at the hospital, Uncle Wang explained his symptoms to the doctor, and the doctor asked about some eating and drinking habits. Then the doctor told you to do a urinalysis first. The results of urinalysis came out: urine calcium 8.3mmol/24h, urine phosphorus 1.6g/24h, uric acid 420umol/L, which shows that Uncle Wang's urine calcium and phosphoric acid content are exceeded, uric acid is also high, there is a possibility of stones.
The doctor then recommends an ultrasound to determine if kidney stones are present. The results showed the presence of a small number of small kidney stones. Because Uncle Wang's stones are small, small and smooth, and do not cause severe pain, the doctor prescribed a month's worth of stone removal granules. The doctor also advised to develop a good habit of drinking water regularly, and the daily water intake should be about 1.5-2L, so as to ensure sufficient drinking water to avoid the recurrence of kidney stones.
In fact, Uncle Wang discharged the stones in about half a month, the whole person was refreshed, his waist was no longer sore, and his inner thighs no longer throbbed. I finally realized the importance of drinking water, and prepared a large kettle at home to ensure sufficient water intake every day.
One day, Xiao Zhang, the owner of a nearby commissary, came back with a four-wheeled cart of bottled water and was unloading the goods. This made Uncle Wang feel novel, Uncle Wang almost never drank bottled water, although he used to drink very little water, but he always boiled tap water to drink.
Uncle Wang hurriedly called and asked the doctor: "Which is better, this bottled water or boiled water, which is more conducive to health, do you need to go to the store next door to bring a few buckets back to drink?" The doctor on the other end of the phone smiled and said, "No", and began to tell Uncle Wang what is the quality of tap water, and whether it is healthy to drink after boiling?
1. Is boiled tap water healthy?
There is always a rumor that "the minerals contained in tap water can cause kidney stones if you drink tap water for a long time", but this is not the case. Tap water should meet the relevant standards when it leaves the factory, and the drinking standards issued by the state have strict regulations on the content of restricted bacteria such as total coliform bacteria and arsenic, cadmium, mercury and nitrate.
Tap water sources are widely distributed and diverse. Some tap water comes from rivers and lakes, and some comes from groundwater, but before it is actually transported to households and gushes out of the tap, there must be some treatment procedures to remove insoluble and soluble impurities and a range of pathogenic microorganisms from the water.
After a set of processes of sedimentation, adsorption, and drug disinfection, the tap water obtained by the waterworks will be sent to Wanjia through the pressurized pipeline if it meets the relevant standards, and if it fails to pass the test, it will have to be restarted.
However, there will always be doubts about the chlorine used for disinfection, in fact, the levels of chlorine and chlorine-containing compounds in tap water do not meet the pathogenic limit, and they are far below the chlorine content limit of the drinking standard for tap water.
Moreover, there are also waterworks in tap water that use ozone oxidation for disinfection, so tap water is safe and reliable. Boiling tap water is a double guarantee for health. Tap water can be mixed with microorganisms during transportation, so boiling is a good way to solve this shortcoming.
Some people may wonder if the rumor that "a thousand boiling water can't be drunk" is true.
Some rumors say: "After repeated boiling of tap water, the nitrite content in it will increase, and it may exceed a certain limit, which has the risk of causing cancer and endangering life and health." ”
Hu Wenmin of the Guangdong Provincial Food Inspection Institute used ultraviolet spectrophotometer to measure the nitrite content in water samples such as purified tap water that had been boiled repeatedly. The final results showed that after 10 hours of continuous boiling a day, the nitrite content in tap water increased from 0.0006 mg.L-1 to 0.0236 mg.L-1, and the final value was much less than the limit, less than 3% of the limit.
With the increase of storage time, the overall trend of nitrite content in boiled purified water and tap water is only slightly higher, and it is far lower than the national standard.
According to the provisions of the standard test method for drinking water GB/T5750 in mainland China, the nitrite content in drinking water should not exceed 1mg/L. To reach this limit, the same pot of water must be boiled more than 300 times, so how much water will be left after evaporation?
Therefore, the so-called "thousands of boiling water causing cancer" is purely a rumor, and drinking thousands of boiling water in ordinary life has no effect on physical health. Since boiled tap water is completely drinkable and beneficial to human health, can bottled water also be drunk for a long time?
2. Is it healthy to drink bottled water for a long time?
Many people believe that bottled water is cleaner and tastes better than tap water, and can be drunk directly.
In fact, bottled water has a shelf life, some families buy large buckets of water to drink two or three weeks to drink, and bottled water in the unopened case of shelf life is generally three months, and the transportation process and warehouse storage also consume a certain shelf life, the actual drinking shelf life may be shorter.
About seven days after the bottled water is opened, the hygiene inside has dropped significantly. Half a month later, the total number of colonies in the bottled water at this time was almost all exceeded, and drinking it directly may be harmful to health. Therefore, for bottled water that has been opened for more than a week, boiling and drinking it can be more sterilized and disinfected, which is more conducive to health.
Some water dispensers have the function of boiling water, but the heating temperature of the water dispenser itself may only be 95 °C to achieve the effect of sterilization and disinfection, it is best to use a kettle to boil water and to boil, and the inner tank of the water dispenser may also breed bacteria due to residual water. It should be cleaned and disinfected regularly to keep it safe for drinking.
Bottled water is also divided into good and bad, and the quality standards of bottled water from different brands are different, and the quality control is different, among which the water source is an important distinguishing factor. Before filling, the regular manufacturer will go to the water source to carry out a series of inspections to ensure that it is rich in minerals and trace elements that are beneficial to the body.
Subsequently, the indicators of bacteria, pathogenic bacteria and other microorganisms in it are analyzed, and the monitoring should be carried out throughout the year to ensure that the quality of the raw water is stable and up to standard throughout the water intake period.
Then, after a series of filtration, sterilization and disinfection, the filling is carried out in a clean and hygienic environment, and the filling barrels are also sterilized. The filled finished water also needs to undergo sampling inspection, testing, and sample retention before it is transported to the consumer's home.
For the bottled water produced by the nameless workshop, it cannot be guaranteed whether it meets the drinking water standards, so the bottled water must be purchased through formal channels.
Some researchers have systematically analyzed the drinking status of patients with kidney stones, and found that drinking well water is more likely to develop kidney stones than drinking tap water, because the well water contains higher levels of calcium.
Well water comes from groundwater, and high-calcium water and alkaline water quality promote the formation of oxalate stones. There are two main sources of bottled water sold on the market, one is groundwater such as mineral water and the other is tap water.
The probability of causing stones in bottled water cannot be generalized according to different water sources, and it mainly depends on the mineral content of the water source.
However, moderate intake of minerals and trace elements is conducive to the body's metabolism, so scientifically choosing bottled water containing an appropriate amount of beneficial mineral components is beneficial to human health.
Some bottled water, with tap water as a water source, through reverse osmosis and other ways to prepare bottled pure water, not only remove harmful chemicals and bacteria and bacteria to the human body, but also remove the elements that are beneficial to human health, the human body can not take trace elements from it, and it is not recommended to drink it for a long time.
Since there is no problem with regular bottled water for daily long-term drinking, we can choose to boil tap water to drink, or choose bottled water to drink daily, as long as we drink water, and we don't have to care too much about the way.
Rather than drinking water, it is more useful in daily life to judge and identify the water quality to avoid non-compliant waterworks and unscrupulous bottled water vendors. So how do we judge the quality of drinking water?
3. How to judge the quality of drinking water?
How do we identify the quality of water in our daily life? Whether it is tap water or bottled water, we can test the water quality according to the following three points:
- 1) Sensibility Judgment:
Identification of the external manifestations of water, through the method of smelling, looking at color, and distinguishing turbidity, the drinking water such as tap water or bottled water is preliminarily screened. If the water is cloudy due to sediment, yellowish color, or abnormal smell, it is not recommended to drink it.
- 2) Epidemiological Judgment:
Water samples can be taken and sent to relevant testing sites for pathogenic microbial testing. Some restricted bacteria such as E. coli are not allowed to appear in drinking water, and some pathogenic microorganisms that can cause diseases must be detected.
- 3) Judgment on the safety of disinfection water quality:
Samples are taken and sent to a testing site to be tested for chlorine content. A normal waterworks should not use excessive chlorine compounds for disinfection that would cause the chlorine content to exceed the standard. However, there may be unscrupulous bottled water vendors, and in order to achieve the purpose of disinfection, there is no restriction on the addition of chlorine-containing compounds, so it is better to be cautious in everything.
According to the "Sanitary Standards for Drinking Water", the requirements for drinking water should meet the following basic requirements: should not contain pathogenic microorganisms, chemical substances should not endanger human health, radioactive substances should not endanger human health, and drinking water should have good senses and should be disinfected.
In addition, the content of specific restricted bacteria, heavy metals, nitrates, etc. should be within the limited range.
Uncle Wang followed the doctor's advice this time, boiled water every day, and drank it cold, which can ensure about two liters of water a day. As a result, the number of urinations is also increased, and the color of the urine is also lighter. Now, he is free of stones, saying "thanks to the doctor's treatment and advice".
After Uncle Wang recovered, not only did he feel more energetic, but he also made his old friends increase their knowledge, and every day he could be seen talking about health knowledge with a group of old grandfathers in the village, not to mention how colorful his life was.
It's hard to say who is healthier to buy bottled water to drink and people who boil water to drink, but as long as you maintain regular drinking habits and drink enough water that meets the drinking standards every day, it is a benefit to metabolism and is good for health!
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