My house is a small high rise, and the bathroom dark guard always smells not the smell of stool,

The floor drain smells back, right?

Either there is no anti-return air device in the exhaust pipe, just install one. The ventilation is blocked, and the smell of your house can't get out.

Have you ever seen those pieces of plastic behind a typical exhaust fan? When the exhaust fan is turned on, they are opened, and when they are closed, not all bath bombs carry this device.

The exhaust duct cannot be blocked.

To find out what the smell is in the mouth. I figured it out, if it is a reverse smell of the drain pipe, use anti-odor equipment. Such as: floor drain, the use of anti-odor floor drain.

The exhaust pipe of the bath bomb has a return air baffle at the exhaust pipe mouth.

If it is the smell of the ground, it is when the ground is pasted, the plain cement slurry combined under the floor tiles is not waterproofed, resulting in the mortar containing sewage, and it will smell after a long time. In this way, it is only possible to open the door frequently for ventilation.

The bath bomb seems to be fanning down. Without return air protection.

If you have a vent. That smell may come out of here.

The solution is to install an exhaust fan with shutters. Only in and out. Relatively better.

Be sure to find out where the smell comes from, whether it's a drain or a crossing

The vents can be fan-like.

As a last resort, it will be blocked again.

You try to use activated charcoal, which is to remove odors to purify the air, and the effect is very good

It is not possible to plug it, it must be ventilated: the bath bomb is not brought.