I can t stand the smell of the toilet and it kills people

Problems with the toilet! The pressure of the toilet bowl is light enough to resist the odor. Optional 'one-litre fixture' The one-litre fixture has a one-way reverse blowdown valve on the drain outlet.

The valve is controlled by a foot switch! If you don't step on it, you can't open it. It can effectively prevent the overflow of fecal dirt and prevent viruses, bacteria and insects from entering the room.

If the sewer pipe is not an S-pipe, it should be a problem with the sewer pipe.

In general, it won't be a problem with the drain line (there should be an S-bend, unless you have changed the drain pipe. It is recommended that you replace the toilet (one that flushes smoothly, not necessarily a brand name).

The easiest way to verify this is to check with 1 pipe dredging company that they should have a small high-pressure cleaning device that can remove contaminants from the pipes.

FYI.

It's very troublesome, generally the backwater pipe can not be closed sewer caused, the toilet is generally not this kind of problem, you take a good look, where is the water surface in the toilet? If you can't even see the water, it's basically broken, and you don't know if you can repair it, so you have to replace it!