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Is it slow (not strong enough)? Or is the drainage going slowly? Can you still see the suction power in the washout?
If the drain is slow, check whether the reverse bend of the toilet is not smooth.
If the flushing is slow, replace the water tank fittings in the total distance.
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Maybe the flush hole of the tank is blocked. Unblock it.
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Or the one that went into the water, maybe it was so deep.
This phenomenon is that the drain is not completely blocked, because after the toilet water is put down, there will be a vacuum in the pipe, and it will slowly gurgle, which proves that it has been blocked. When it is unblocked, due to the effect of vacuum, there is only a loud sound.
Generally, it is a problem with the toilet, the sewer pipe of the toilet is very thick, and there is generally no problem, but it may also be that the construction waste that fell into it during the renovation was blocked.
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Did you install this toilet and it didn't go well, or did you just start to have this phenomenon recently? If it is said that after the initial installation, this is the proof that there is a problem with the pipes below. If it started recently, there should be some blockage, you can find the person who unclogs the sewer and it will do it for you.