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It is likely that there is a slight blockage between the drain pipe under the faucet and the drain pipe of the toilet bowl at the joint or elbow, and there is air backflow when the faucet drains.
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It's simple, it's a little bit of air that is generated by the impact of the water on the water, and the air is enclosed in the water, so it bubbles.
It feels like sheung shui is clogged up here, so you can poke it with a thin wire or sweater needle. Not being able to get water has nothing to do with the washbasin faucet.
It is estimated that it is caused by the large change in the diameter of the front and rear pipes, the thickness of the front section and the thin back section, and the high pressure of the water.
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