I live in a mobile home, which probably makes this problem worse, because nothing is level. I also live in Kalamazoo, which is supposed to have the hardest city water in the US. My toilet won't quit running. It doesn't matter what I do. The problem is that there is so much hard water build-up in the tank that the valve can't fit into its hole. I have used products to break up some of the build-up, but it is too hard to get some of it. I can't reach into the pipe to break up what is in there, which is part of the problem. It is getting louder, and more constant all the time. What can I do?
Natalie, quite often replacing the flapper will resolve problems like this and it's relatively inexpensive to try. The old flapper has probably gotten hard and won't seat properly plus I'm sure that there is buildup on the bottom side adding to the problem, a new one will be plyable and clean and should seat/seal the opening.