Questions about tap water

It is true that this kind of water can be drunk directly from the tap water pipe. Mainland people have not heard of it, but it is available in Hong Kong. At present, there are four types of water, one is direct drinking; One can be used for washing vegetables, rice and water, and the grade is the same as our tap water; One kind is seawater pumped from the sea, which is used to flush toilets, which is also characteristic of Hong Kong.

there is also a kind of reclaimed water, which is named after the connotation of water supply and drainage. "reclaimed water" is named in Japan and has many interpretations. It is called "reclaimed water" in sewage engineering and "reclaimed water" in factories, and generally takes water quality as a sign of distinction. It mainly refers to the non-drinking water that can be reused in a certain range when the urban sewage or domestic sewage reaches a certain water quality standard after treatment. In the United States, Japan, Israel and other countries, a large number of reclaimed water is used for toilet flushing, garden and farmland irrigation, road cleaning, car washing, urban fountains, and supplementary water for cooling equipment. China also uses reclaimed water.