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Do you immediately confirm that there is an S-shaped trap in the sewer pipe under the toilet in your bathroom?
The smell coming out of the toilet water seal indicates that the water seal is very low, or even broken, and the national standard requires greater than 50mm deep;
I know how to deal with these 2 points after you confirm them. Keep it to your satisfaction.
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It is likely that the floor drain did not prevent the smell.
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It may not be a problem with the toilet, it is advisable to look at the floor drain and the drain of the basin.
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We have the same problem in our family. It's okay during the day. It stinks to death at night. What the hell is going on !!
There is no elbow for entering the water, and an elbow can be solved.
Reinstall it, this is not a radical cure, if you have to find a way to solve it, try this: record the water level of the squatting toilet, drain the water of the squatting toilet, and after drying, use glass glue to glue the porcelain piece at the bottom of the upper end of the hole of the squatting toilet, and the depth is just 1 cm above the original water level. After drying, the smell can be sealed, but it will affect the caliber of the stool (difficult to go), and if there is a resident upstairs, he will also flush out the gas.
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Wrap soundproof cotton, or directly erect a light steel keel wall to wrap the pipe. Also, the pipe is in the bathroom on the first floor and you can hear it in the bedroom? If so, you can make the bedroom door a sealed wall, and the upholstered door can be soundproofed.