Although the economy of light speed development makes our life more and more moist, behind this magnificent development, it is difficult to avoid the aggravation of pollution. A stream of clean air and a mouthful of clean drinking water, how easy it was to achieve before, has also become a desire that we can't reach in the reinforced concrete forest.

In view of the air pollution, we use the air purifier to clean the air indoor, and to the headache of drinking water problem, a reliable household water purifier seems to have become a necessary choice for every household. So in the face of so many aquatic products on the market, what are their differences? For daily families, how to choose water purifier?

Before shopping, let's understand "water"

Before understanding the water purifier, we need to understand our daily domestic water. In fact, in China's cities, tap water has very strict quality requirements. At present, the implementation of China's waterworks is the "drinking water health standards" issued in 2012. Among them, the inspection standards for water quality have been increased from 35 to 106, and some key indicators are in line with the standards of the European Union and the United States. Even in remote prefecture level cities or county-level cities, the quality of tap water has to go through 42 monitoring items, in which turbidity, bacteria, chlorine content and other data have to be monitored in real time.

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It has to be mentioned here that chlorine is the most easily misunderstood substance in tap water. As we all know, in the last step of tap water treatment, water plants will add liquid chlorine in water. This is because chlorine will react with water to form hypochlorous acid, which is a strong oxidizing substance, and can prevent tap water from being polluted by bacteria during production, storage and transmission Pollution, because of the low cost of chlorine, since its invention in 1902, has become the world's mainstream means of disinfection of tap water.

However, it must be clear that too much chlorine will cause serious harm to human body. It can stimulate eyes, nose, throat and upper respiratory tract. It can cause acute pulmonary edema and pneumonia. When the concentration is high, it can paralyze the respiratory center and cause "flash death". Long term inhalation of low concentration of chlorine can cause chronic poisoning and lead to rapid aging in the body. This has also become the main example of most people's saying that "tap water" is not safe, but we know that any harm, regardless of the dosage, is playing hooligans. According to the current national standard, the chlorine content must be between 0.3mg/l and 5mg / L at the time of leaving the factory. According to the measurement calculated by the animal experiment of WTO, the human body takes less than 1G chlorine per day, so it is impossible to measure the adverse reactions. This means that each liter of water must contain 500 mg of chlorine, which is much higher than the safe measurement of 0.3-5 mg / L, based on the daily drinking volume of 2 liters per person.

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According to this standard, China's tap water has reached the drinkable standard when it leaves the factory. Even if the residual chlorine is obvious in taste and smell, at least it won't make you have diarrhea, and you don't have to worry about the adverse reactions caused by chlorine.

But there is a clear difference between "reaching the drinkable standard" and "being drinkable". Tap water can be drunk directly when it leaves the factory, which does not mean that it can be drunk directly when it reaches your tap. The key problem that causes the current situation of tap water in China is the secondary pollution of the water source itself. The first problem is the safety of the pipeline from the water leaving the factory to entering the house. At present, most cities, even some areas of Shanghai, still retain the copper or cast iron pipes laid in the early days of the founding of the people's Republic of China, which are easy to produce corrosion and rust, and the subsequent plating Although zinc steel pipe is better than copper pipe in rust prevention, but with the use of accumulated, the rust situation is not optimistic.

Secondly, the secondary water supply of the water tank in the residential area is also the culprit of the secondary pollution of the tap water. According to the regulations, the water pressure at the end of the tap water pipe should be able to transport the water to a height of at least 14 meters, which means that in order to ensure the water supply for the high floors of the old six story building, the water needs to be pumped into the water tank on the top floor first, and then supplied downward by the way of normal water pressure. However, the water tanks of such buildings are usually managed by the property management department. The cleanliness of the water tanks is worrying. These water tanks often become the habitat of snakes, insects, rats and ants. A few years ago, the body of a Chinese girl, LAN Ke'er, was also found in the water tank on the top floor of the hotel. These "accidents" will become the main culprits of water pollution.

Therefore, in our daily household water, the original "clean" tap water is often added with all kinds of dirty things that affect our health, such as hair, sand, insect eggs, viruses, bacteria and so on. To completely separate them from our daily drinking water has become the goal of the water purifier.