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This happens on the lower floors of high-rise buildings. The sewer pipe blocked the lower part of his home, causing the upstairs sewage to flow from the toilet and floor drain in his house. When the high-rise occupants drain too much, the strong pressure will cause the toilet to spray water.
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That's because the toilet sewer is blocked down to the middle of the next floor, and the water from the upper sewer has nowhere to drain, so it is directly discharged from this toilet, so it is recommended to find a pipe cleaner to clean it.
It's best to dredge it yourself, take a skin and poke it a few times. It is recommended to buy a toilet with large pipes, which is not easy to clog.
Unless there is no water in the toilet, there should be no explosion if there is water, because there is water in the connecting pipe, and the biogas from the septic tank far away cannot be returned at all.
The pipes of the toilet and the kitchen are designed separately, because of cross-contamination, and his toilet pipes go to your kitchen, which is itself a source of pollution, but if you don't care, and he does a good job of the pipes to ensure that there is no leakage, and the outside is also a protective layer, there is no problem, just afraid of leakage.
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