Why does the tee of the toilet drain main bar click?

Because there is also that water or uh some excrement falling down on other floors, there will be a clicking sound.

This is where there is a whole set of small tees before it, and this sound will appear, and it is a sound of gas and water. This is where the whole set of small tees comes in, and this sound appears, and it is a gas, the sound of colliding with water.

Something's stuck there, and there is a sound when the water flows by.

It may be blocked, caused by unfavorable drainage, and the sound is loud.

The toilet sewer main-3 pass clicks, probably where the exercise can be changed.

It is possible that there is a foreign object in the tube that is blocking the sound.

Why does the toilet drain main -3 pass click, maybe because your tee is unqualified, the quality of the tee is not good?

It may be blocked by air, or there may be debris.

There must be a foreign object stuck around the corner.