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The sound of water entering the water tank, flushing a lot of water, using a lot of water, of course, the water entering for a long time.
It is recommended that you check that the waterways upstairs and downstairs are normal or blocked.
Before going to the toilet, take half a basin of water and pour it into the toilet, the water level in the toilet will be pressed down and will not return as when it is flushed, and the water level is very low, just throw a paper towel.
This is usually fine, because it is just on the skin, you should pay attention to wash it, but you should also be careful in case there are other infections.
Explain that the exhaust pipe of your entire building is blocked. >>>More
Is it the sound of water ingress or the sound of the sewer pipe going into the water, but nothing else will make a sound.