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This is because the toilet and the wash basin are connected to a sewer pipe, and because the ventilation pipe on this sewer pipe is a bit blocked, the toilet will breathe through the wash basin when flushing, and sometimes there is a sound.
Hello, there's nothing about this, it's just ordinary.
Well, my family has always done this, but I used a basin to catch the water for washing my hands.
This is the basin is not closed by bent water, and a pipe goes straight to the sewer, causing the sewer smell to go up and back to the smell. >>>More
It is possible that the toilet is reclaimed water, and it is time to buy water for tap water.
Of course it's not good, I came early in the morning and saw that I was in a broken mood, so I changed it quickly.