Why is there a bad smell floating down from the toilet upstairs?

There are several reasons for the bad smell coming down from the upstairs toilet:

1, the floor drain smells. The floor drain in the bathroom should have a reverse bend. Usually, water seals are used to prevent odor. It is recommended to use odor-resistant floor drain.

2. The joint between the sewer pipe of the sink and the sewer is not tightly sealed, which becomes the channel for the sewer odor to enter the room. You can let the decoration workers seal the gap at the interface with glass glue or other adhesives, so that the gas can't be emitted.

3. The toilet smells, the toilet structure is unreasonable, and the water seal is not tight, which will cause the sewer pipe to smell.

4. When the toilet is installed, the dislocation of the sewage pipe, the aging of the base sealing ring or the poor seal of the base will all lead to odor and even sewage leakage, so it is best to reinstall it.

5. The drain pipe of the bathroom on the floor is blocked. Because the water seal position of the bathroom is nearly 70 cm higher than the sewage outlet of the sink, this trap has the function of deodorization. Home improvement toilets generally have traps. Therefore, it is best to find a property when this problem occurs.

5. Sewage will come out when the reconstructed pipeline is not equipped with a trap. Therefore, it takes a lot of impact to discharge gas or sewage from the toilet, and there is a gap between the toilet pressure and the sink.

6. There is no windproof plug installed in the air outlet at home.