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This is the phenomenon of flooding, because the sewer pipe does not flow enough when the pool is discharged. Use a PE pipe with a diameter of 50---60 cm, insert it into the sewer nozzle (the surrounding gaps do not leak water, sprinkle a little), and the PE pipe can be 10---20 cm above the ground.
First see if the elbow of the sewer pipe is blocked
This has no maintenance value, repair a piece also to plane off the entire tile, it is recommended to buy a stainless steel basin of similar size to install inside, around with sealant sealed can be used, dozens of yuan to get.
My PVC sewer pipe may be clogged. First open the maintenance cover at the bottom of the P bend to clean up the blockage, and then screw it back.
Under the sink, there is a cleaning opening on the pipe (like a lid, usually at the bottom), unscrew it, dredge it from here, and see if it works. >>>More
Caused by the sewer pipe being unblocked, that is, the water pipe below the intersection of the two pool pipes is blocked.