Sometimes the fill valve can vibrate while the tank is filling. Try removing the tank cover and flush the toilet, then check to see if you can stop the noise by pushing down or up on the float assembly. It may be as simple as adjusting the flow rate.
Hearing water flowing after flushing is a common as water flows down the soil lines
Well i keep my pet zombie down there, but with yours i'd expect it's just the water being replaced by air in the pipes.
Pipes can moan and groan from expansion. Pipes may also rattle if the hangers allow them to move much.
Most likely from the pipe hitting a resonant frequency when the water runs through. I don't know what can be done to change that without opening up the wall to get to the pipes.
'cause water is going though them
Hair can be flushed down a toilet, but only a small amount at a time, otherwise you risk clogging the pipes.
This is water hammer and is caused by rattling pipes that are not secured down properly
it might cause an explosion or it might cause an oxidation and the rust of pipes.
If it is at freezing temperature, then you have an issue with uninsulated pipes.
I do not know if popcorn can be flushed down the toilet. So, I wouldn't try it.- Ashton Smith
The sewer
Depends on if it needed to be flushed or not.
There is an air pocket in one of your pipes, or you could have a small clog. I had the same problem and live in Canada so I got Roto Rooter up to clean out my pipes. It didn't cost that much.
Bad venting
Water and waste
Everything is possible but most likely if it was flushed then it will not get caught in the pipes. ------------ Depending on what you are flushing, it can most certainly get caught in the pipes. Older plumbing cannot handle "modern" things people flush down the toilet, such as feminine hygiene products. These can get caught up in the plumbing, slowly building up and eventually blocking the pipe, creating an UGLY mess. If you take a look at most sit-down commodes you will notice that there are a couple of really sharp turns before the system even enters the floor. At these turns, certain hard things like glasses and cell phones can get caught in the toilet itself.
havent you every seen flushed away? the sing and dance and put barbie doll clothes on and go down your toilet and come back up.