Running toilet- just keeps draining in the tank
I have a toilet that does not have a floating ball. It just has a flapper, attached with a plastic strip, to the handle. When the toilet is flushed, everything is fine except when the water level rises in the tank, it overflows into the overflow tube and the hose that goes into the tube just keeps sending more water down the tube. I read in another thread that the tube should be below the water level in the tank, but I don't know how to adjust the level, and I can't move the tube up. Any ideas? I wish I could attach a picture.
Thanks for any help. Right now I'm turning the water off until someone needs to use the toilet because I just can't take listening to it!