Everyone has to drink water, but the secret of tap water is clean only the water purifier knows

Source：This site    Release time：2018/11/4 10:36:06

Although the economy of the development of light speed has made our life more and more moist, behind this magnificent development, it is difficult to evade the pollution, a clean air and a clean drinking water, how easy it is to achieve the usual things. However, it has become a hard-to-reach desire in the reinforced concrete forest.

For air pollution, we use clean air air purifiers indoors, and to the headache of drinking water, a reliable household water purifier seems to be a must for every household. So what are the differences between so many water purification products on the market? For the daily family, how do you choose a water purifier?

Before you buy, let's first understand - "water"

Before we understand the water purifier, we need to understand our daily household water. In fact, in China's cities, tap water has extremely strict quality requirements. At present, the water supply plants in China are all implementing the "Sanitary Standards for Drinking Water" promulgated in 2012. Among them, the inspection standard for water quality has been upgraded from the original 35 to 106, and some key indicators are consistent with the standards of the European Union and the United States. Even in remote prefecture-level or county-level cities, the quality of tap water must be monitored through 42 items, and turbidity, bacteria, chlorine content and other data must be monitored in real time.

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It is also necessary to mention the most misunderstood substance in tap water - chlorine. It is well known that in the final step of tap water treatment, the water plant will add liquid chlorine in the water, because chlorine reacts with water. Hypochlorous acid, a strong oxidizing substance, prevents the secondary pollution of tap water during production, storage and transportation. Due to the low cost of chlorine, it has become the mainstream tap water disinfection in the world since its invention in 1902. means.

However, it must be made clear that too much chlorine can cause serious harm to the human body. It can irritate the eyes, nose, throat and upper respiratory tract. Causes acute pulmonary edema and pneumonia. When the concentration is high, it can paralyze the respiratory center and cause "sparking death". Long-term inhalation of low concentration of chlorine can cause chronic poisoning, leading to excessive aging in the body. This has become the most important example of the unsafeness of most people's "tap water", but we know that any harm that is thrown away from the dose is a hooligan. According to the current national standards, the chlorine content must be between 0.3mg/L and 5mg/L at the time of shipment. According to the measurement calculated by the WTO through animal experiments, the human body can consume less than 1g of chlorine per day, and it is impossible to measure adverse reactions. This means that one liter of water per day must contain 500 milligrams of chlorine, which is much higher than the safe metering of 0.3-5 mg/L.

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According to such standards, China's tap water has reached the standard of drinking when it leaves the factory. Even if the residual chlorine is more obvious in taste and smell, at least it will not let you diarrhea, and there is no need to worry about chlorine. Adverse reactions.

However, there is a clear difference between “reachable drinking standards” and “drinkable”. Tap water can be directly consumed when it leaves the factory, and it does not mean that it can be drunk directly when it reaches your faucet. The key problem causing the current status of tap water in China lies in the secondary pollution of the water source itself. The first problem is the safety of the pipeline from the water to the household. Most cities and even some areas in Shanghai still retain Copper pipes or cast iron pipes laid in the early days of the founding of the People's Republic of China are prone to corrosion and rust. The subsequent galvanized steel pipes are better than copper pipes in rust prevention. However, with the accumulation of rust, the rust conditions are not allowed. optimism.

Secondly, the secondary water supply of the residential water tank is also the culprit of the secondary pollution of the tap water. According to the regulations, the water pressure at the end of the water pipe should be able to transport the water to at least about 14 meters, which means that the old 6-storey building must be high. Water supply on the floor requires water to be pumped into the top floor tank and then supplied downwards with normal water pressure. However, the water tanks of such buildings are usually managed by the property. The cleaning of the water tanks is inevitably worrying. These water tanks often become the shelter of snake worms. In the past few years, the body of Chinese girl Lan Keer was also on the top floor of the hotel. Water tanks were discovered and these “accidents” became the culprit of tap water pollution.

Therefore, in our daily household water, the original "clean" tap water is often added to all kinds of dirty things that affect our health, such as hair, sand, eggs, viruses, bacteria and so on. It is the goal of the water purifier to completely separate them from the water we drink everyday.