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The reason for this problem is that the float inside the tank is jamming the plug.
Press the flush button and quickly let go, if that doesn't work, repeat several times.
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Go to the kitchen and bathroom store to buy a set of changes, it's very simple, only a few dollars.
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Get some black tape around it.
I'm a distributor of toilets, and I'll tell you that it has nothing to do with the size of the water flow or the water pressure. (If your home is fully automatic, it's all about water pressure.) >>>More
In the case that it is determined that the nut that is not in contact with the water supply pipe and the toilet bowl is not loose, it may be that the sealing gasket was not padded when the toilet was installed, or the sealing gasket is broken, use a blade to separate the glass glue under the toilet bowl, and then check or replace the lower sealing ring.
Your drain valve is not sealed.
Turn the drain valve counterclockwise, and when you hear a "stuck" sound, you can remove it. Wash thoroughly with the hose of the nozzle. Wash the yellow water in the water parts. >>>More
There are also in-line and S-bend, but the best one is the siphon type, which flushes cleanly.