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Anonymous users2024-01-23Water generally contains small amounts of calcium, magnesium ions, ......Over time, they will form water-insoluble compounds, namely calcium carbonate and magnesium hydroxide, which are what people call "water alkali" or scale. Most of the water in nature will produce this kind of substance, and the scale formed over a long period of time also contains a lot of sediment, accompanied by some other impurities and trace elements, including lead, zinc, arsenic and other heavy metals, and is very hard, just like sedimentary rocks, if after thousands of years, it will also form stones.
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Anonymous users2024-01-22Mineral crystals after the reaction of cement with chemical elements in water.
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Anonymous users2024-01-21, it's been washed by water for a long time and there is no color, but the dirt is still.
In general, there is no automatic flushing in the village public toilets. Most of the water in the city is self-flushing. Generally, public toilets like small houses are filled with water in advance, and if people use them too much, there will be no water.
"Public"The word "" means that everyone can enjoy it.
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Must be pressed by hand. If you are worried about hygiene, just wash your hands again after pressing. You can also wrap it in a paper towel and press it again.
I've seen public toilets without partitions, but I've never seen soundproofing