What is the reason why the toilet bowl often rumbles for unknown reasons? How to solve it?

There is a small white pipe in the toilet tank, which is to store water under the toilet, and it is the sound caused by the backwater after it has finished putting the water, to see if the pipe is crooked.

It's also possible that there is sand or something in your inlet valve (that is, the blue inlet valve in the tank) is not closed tightly, or the water level is too high, and it goes out of the easy water hole.

Remove it from the lid and open it to clean it and turn the water level down.

It is estimated that you can't solve it yourself, you can call the after-sales service phone.

If the toilet shares a sewer line with other houses, you will hear the toilet roar when the other houses drain the water. The toilet has a separate sewer line, and the septic tank will make a sound of fermentation bubbles. Because of the limitations of the pipe wall, the sound will travel along the air inside the pipe; Coupled with the resonance of the pipe, the sound will be relatively loud.

As for the solution, it seems that there is no such thing at present, and the sewers of many high-rise buildings are so loud.

It's the sound of water, it could be the upstairs of your house using the toilet, or it could be the same water pipe being used by the user.