The tap water used in our daily life can indeed meet the national standard when it comes out of the water plant. However, due to the outdated and aging urban pipelines during the transportation process, the tap water will increase a lot of pollutants when it reaches each family.
Common pollutants in tap water are as follows:
1. Rust
Generally, tap water is transported by galvanized pipes. During transportation, water is easily oxidized with iron, resulting in red iron oxide, which is further oxidized into black ferric oxide. Oxidation occurs, and iron is an essential element for the human body. In drinking water indicators, the content of iron per liter of water should not exceed 0.3 mg. If we can directly see the color of rust or taste the taste of rust in the tap water, it means that the iron content in the water has greatly exceeded the standard.
Excessive iron content not only makes tap water look bad, but also increases the burden on the kidneys, leading to diseases such as high blood pressure and affecting human health.
2. Residual chlorine
We all know that residual chlorine can be harmful to the human body. According to international requirements, the safe amount of residual chlorine should be kept at 0.05 mg/liter of water at the end of the pipe network (faucet of household tap water) to control the growth of bacteria during the transportation process, so municipal tap water contains residual chlorine. The WHO confirmed that while chlorine kills bacteria in water, it also produces a potential carcinogen, chloroform.
3. Bacteria
As we all know, whether it is surface water or groundwater as the water source, bacteria and Escherichia coli in tap water can be said to be ubiquitous. As the source of life, the quality of water quality will also directly affect human health. Especially in recent years, the pollution of rivers, rivers, lakes and other water sources has become more and more serious. The bacterial contamination is also uncontrollable.