Residual chlorine "harm" know how much？You can't just use the tap water

Tap water, an indispensable resource in our daily life, its quality has a direct impact on our health。And you know what？In this seemingly clear tap water, there is a hidden killer - residual chlorine。

Before tap water flows into our homes, it needs to go through a long process, including municipal pipe networks, community pipe networks, high-rise water tanks and other links。In this process, in order to control bacteria and germs in the water, the water supply department will add a certain concentration of residual chlorine in the water。

Tap water containing residual chlorine

Bring to the boil and drink

Chronic poisoning

......

01

What is residual chlorine？

Residual chlorine refers to the chemical reaction between the added chlorine and the bacteria, microorganisms, organic matter, and inorganic matter in the water during the water treatment process, and a part of the chlorine is consumed, and the remaining part is the so-called residual chlorine。

According to China's "drinking water sanitation standards", when the water and chlorine contact 30 minutes, the residual chlorine in the water should not be less than 0.3mg/L, pipe network end water should not be less than 0.05mg/L。

Although the presence of residual chlorine is indeed necessary to inhibit bacteria, if the residual chlorine in tap water exceeds the standard, its potential threat to human health can not be ignored。

For example, have you ever smelled a whiff of disinfectant while washing your hands or boiling water？That's right. That's the leftover chlorine。

02

Why is residual chlorine added to tap water？

Tap water is supposed to be a healthy and safe source of drinking water。However, due to environmental pollution, harmful substances such as bacteria in the water proliferate, in order to inhibit and kill these bacteria, the water supply department adds chlorine in the process of treating water。

Due to the high cost performance of chlorine gas, it is widely used in the domestic water treatment industry。In fact, residual chlorine is still used by more than 80% of the world's water plants as an effective means of disinfection。Therefore, a certain amount of residual chlorine must be maintained in municipal tap water to ensure the safety of microbial indicators in drinking water。

03

What is the harm of residual chlorine to the human body呢？

When the residual chlorine content in tap water is too high, it is easy to form trichloromethane after heating, which is a globally recognized strong carcinogen。

Studies have shown that trichloromethane will increase by 3-4 times than tap water after heating, and if the residual chlorine can not be removed, the hot drinks we drink every day or the food after boiling may increase our body's carcinogens by 3-4 times。

Chlorine will destroy the nutrients in vegetables, fruits, grains and other foods, especially vitamins and minerals, which has a serious impact on the absorption of nutrients in the human body。

What is more frightening is that long-term drinking of tap water containing residual chlorine may lead to chronic poisoning, which is characterized by neurasthenic syndrome, liver damage, digestive dysfunction, acrolytic bone disease, skin damage and other diseases。

In cases of acute poisoning, patients may experience dizziness, headache, nausea, chest tightness, drowsiness, staggering gait and, in severe cases, coma, convulsions, and eventually death。

04

How can we prevent it？

In order to protect the drinking water health of you and your family, Xiaobian recommends that you use terminal water purification equipment that can remove residual chlorine。At the same time, try to avoid drinking tap water directly, especially after heating, because this may convert residual chlorine into more harmful substances。

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