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The toilet structure is designed in such a way that you can try flushing a few times to see if it is normal.
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I recommend you to buy an English bathroom in the future, I have used it at home! , not bad, more affordable!
You should first check the toilet tank, there is a plastic pipe about half a centimeter thick connected to the overflow pipe in the toilet tank, to see if it slips off, if it slips and is not on the overflow pipe, just connect it. >>>More
There are some toilets that can be adjusted, and most toilets have non-adjustable water seals.
It may come out of the floor drain, although the floor drain also has a water seal, but the sealed water is too little, and it is easy to evaporate.
It's nice to cover, but it's hard not to let it dry. It would be better to add a layer of paraffin oil to the surface, because paraffin oil is not volatile.
The toilet water level is much lower than before. It is caused by a large impulse. Simple to try first. Lower the water level of the tank a bit.