When was the drinking water and toilet flushing water separate in Japanese hotels

The water used in Chinese households to drink copy water is not the same as the water used to flush toilets. >>>More

My own home is a pipe, and the toilet is also flushed with drinking water. Public toilets are not necessarily, it is likely to be reclaimed water, that is, domestic sewage and other domestic sewage are reused after a certain amount of treatment. Reused water is not drinkable.

Generally, it is fire water, that is, drinking water.

The water used in the train toilets is directly discharged to the railroad tracks, and the water tank on the train is tap water that is added every time you arrive at the main station, and you can drink it when you boil it with a water heater. But the same water from the big tank is used.

Japan is a country that lacks fresh water, and drinking water includes water for cooking. >>>More