that's because the diaphragm in the fill valve is damaged change the fill valve and you might just have solved the problem
The sewer
Goes straight to sewer
The Chinese baby boy rescued from the sewer pipe after being flushed down the toilet was in Jinhua, Zheijang Province in China.
the sewer
Sewer
Only if it's stuck in the pipe. If it was small enough to go all the way through the pipe, it's in the sewer now.
It is quite possible that your main pipe to the city sewer system has become blocked somewhere between the basement floor drain and the man city sewer line. Could be a result of items flushed down the toilet(s), or damaged pipes as a result of age, tree roots searching for water, etc. Suggest having your main access to the city sewer system checked by camera.
First there is a "U" trap (or something similar). It prevents sewer gasses from coming up the toilet. It also may catch little thing like toys that are flushed so it may be possible to retrieve them. Then there is a waste pipe that connects to bigger waste pipes until it reaches the sewer or a septic system.
some people flush their fish down the toilet when it dies, and the toilet is connected to the sewer.
Probably leaky drain pipe form toilet which passes through that room. Work out which corner of that room is below the toilet, you will probably see a swelling in the wall where the drain pipe is hidden. Call a plumber and get him to fix it.
It is not recommended to flush paper towels down the toilet as they do not break down easily in water like toilet paper. Flushing paper towels can lead to clogs in plumbing or sewer systems. It is best to dispose of paper towels in the trash.
the toilet overflows if either the building sewer, branch line in your sewer system or trap in your toilet gets clogged.