Will the bubble water be blocked if it is flushed in the toilet?

There is a possibility of blockage, if it will be blocked, it is recommended to find a professional drainage worker to dredge.

Yes. It's not plugging itself, it's blocking a lot of dirt, which can clog the toilet. Take it out with a magnet tied to a string.

The wire rag can go down from the pipe when it falls into the toilet, but it is difficult to say whether the pipe will be blocked in the future.

No. Toilet bowl cleaner will dissolve when exposed to water. As long as it's not thrown into the toilet without unpacking, it's fine. It will slowly dissolve the blistering and clean the toilet.

It won't be blocked. Because the volume of the keychain is much smaller than the diameter of the downpipe, it will not clog.