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It must be the sewer reason, hurry up and find the property to come and repair it.
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It stinks. I smell it all.
Hurry up and call someone to get it.
Ask someone to use a pipe dredging machine and solve it at once.
Ask if there is such a situation below, if people don't have it, they will first contact their own home, and try all of them. If it doesn't work, let the property check the main pipe.
I've seen TV reports that there was a place where you were in the same situation, the whole building smelled of gas, and it was later found out that someone had used water from the heating pipe to flush the toilet. In some places, things are added to the water for heating to prevent people from using water. Isn't that the case with yours?
The sewer pipe is blocked, and the one who called to unclog the sewer came over to help you deal with it.
Buy a glass glue and glue gun, put it under the toilet for a week, and wait for the glue to dry. But the bottom of the toilet must be dry when you hit it.