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Theoretically, it shouldn't be possible. Either the toilet mat should be high. Generally, the lower bend of the toilet is above the top of the lower floor.
You can look at the drain above your toilet, which is the upstairs of your house. Suggestion: Just buy a similar toilet (don't buy a bad toilet).
I bought a clean toilet online.
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Do not elbow the toilet sewer connection, because if you are not careful, it will be blocked, and you need to elbow it to the branch pipe.
Buy some oxalic acid to soak it, then rinse it off with a large stream of water, and repeat it a few times to get rid of it!
Of course, don't move, or use it well, after all, she brought it with her, or don't move, it still works.
Case-by-case analysis.
For example, leakage at the shared exhaust location on the roof of the building (so that the gas cannot contact people, and is directly discharged into the air to prevent toxic gases such as biogas from entering the room and being harmful to the human body; >>>More
If it's a cast iron pipe, go buy an adhesive for the cast iron pipe. If it's a PVC pipe, it's time to replace it with a new one. Hope it helps. Have a great day.
Cut off the damaged part and reconnect it with the same size sewer pipe and the corresponding joint.