What s the deal with the constant smell in the bathroom?

Recommend to continue looking for him, 100% it is the installation problem.

It seems that the toilet in your house is not well sealed, and the upstairs sewage will affect your home, so hurry up to find out the reason, there are several places that are prone to aftertaste: >>>More

If it's a floor drain, you can put sand in a plastic bag to block it.

The smell should be emitted from this slit, this hole is used to wear expansion screws to fix the base, considering the damage to the waterproof, it is basically fixed with glass glue, without expansion screws, so this hole is useless, should be sealed with glue. >>>More

At present, the squatting toilet or toilet sold on the market has a water trap, but in the standardized decoration process, a trap will be made when dealing with the caisson to achieve double insurance to avoid the smell of the squatting toilet or toilet. The biggest possibility in your situation is that the floor drain does not have a trap, and the odor is emitted from the drain mouth through the sewage pipe, so the floor drain treatment of the toilet during the construction process must be done with a trap. If the floor drain is replaced with an anti-odor floor drain without a trap, it will still be unavoidable, and it will emit a smell. >>>More