Why is there a shiny oily substance on Shanghai water when boiled and cooled?

Introduction After Shanghai water is boiled and cooled, a kind of oily calcium and magnesium ions float on it. Generally, such water will not contain suspended solids without high temperature treatment. These suspended solids will form.

Why is there a shiny oily substance on Shanghai water when boiled and cooled?

Floating matter of calcium and magnesium ions. Generally, such water does not contain suspended matter without high temperature treatment. The reason for these suspended solids is that during the high temperature disinfection process, the microorganisms in the water are killed and dead. Microorganisms form colloids and combine with water. Chemical phenomena caused by heavy metals. What you use should be groundwater, which contains heavy metals and has high hardness. It is recommended to use a water purifier instead of using your own kidneys as a filter. It is best to dispose of it before drinking.

Is the tap water in Shanghai safe to drink? Many people use mineral water

Aren't you a local? The water quality in Shanghai is like this~~ I think Shanghai is a prosperous metropolis. The fault is that the quality of the water is notst not good~ It has a rusty smell + the water tank is not cleaned regularly + bleach~ 3-in-. 1, it's this weird smell~~ Foreigners settled in Shanghai ~~Almost don't drink tap water~~Directly purified water~~

Ordinary tap water cannot be drunk directly for two reasons:

< p>(1) Chlorine is used in the process of producing tap water. Although purified water can kill harmful substances such as disease-causing microorganisms, the addition of chlorine itself can cause further chemical pollution. Chlorine can react with organic matter in water to form chloroform, which is carcinogenic. At the same time, chlorine also destroys nutrients and can easily lead to heart disease.

(2) In the tap water pipe network, long-distance pipe transportation, old and rusty pipes, dirty water tanks and construction tanks in urban high-rise buildings or unsterilized use all year round can cause secondary pollution. Secondary pollution causes bacteria, viruses and algae to multiply, as well as the original chlorine and chloride, rust, heavy metals and radioactive substances, making the water cloudy and smelly, which is extremely harmful.

Therefore, regular tap water is not standard drinking water. In an increasingly polluted environment, the water we drink into our bodies must meet strict standards. Restore the true nature of water, drinking pure water or pure water added with various minerals meets the needs of the human body.

Some areas of Shanghai have now completed the project of direct drinking water pipes to households. This water is completely enclosed in the factory poolwater and has undergone 16 advanced water quality treatment processes, such as high-efficiency clarifiers. and clear water swimming pools. It has reached the international advanced level of water purification, so that the tap water after leaving the factory can meet the purification standards for direct consumption, so that this water can be drunk directly.

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