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It should be blocked, but it's not very bad, find someone to get through, it's not very expensive.
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Where is the siphon hole?
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The siphon hole is blocked, just pass it through.
Your problem now is that the toilet outlet is slightly clogged at once - you need to fill the water in a bucket and flush it a few times! No big problem!
You have a problem with the design of the sewer pipe, so you can only change the sewer pipe. Generally, the pipe opening above you is large, and the junction below suddenly becomes smaller, resulting in air pressure blocking the pipeline, and there is no other way except to change the pipeline.
In the case of a siphon toilet, the solution is as follows: >>>More
In this case, you can see if there is a trap in the pipe. Because the toilet itself has a trap, there is air pressure in the middle of the two traps, so it will not be able to get into the water. If this happens, we can open the vent at the back of the toilet. >>>More
Buy a dredge pipe, there are 3 meters. The 2-meter one can be sold for about 10 yuan in the hardware store. Or pour in acids (hydrochloric acid, sulfuric acid) for a while and it will be done, and my family will do it like this every time.