For some strange reason the tank keeps getting low on water. But the tank keeps getting low on water and every 10 to 15 minutes it keeps running and filling up every 10 to 15 minutes.
So the toilet keeps refilling up every 10 to 15-minute intervals..
And any thing I read say it could be flapper not sealed probably or the washer has broken into pieces.
But I’m not sure where the water is going? I have not seen any water on the floor.
crazy
Bad flapper/flapper seat, Sometimes over time it will get a groove in the flapper seat and leak no matter how many times you replace the flapper.
Sealing surface must be smooth. Gently run your fingernail around the seating surface. Feel for bumps or grooves.
Also, when handling those parts, if your fingers turn black, the rubber is disintegrated.
That is caused by chlorine/chloramine in the water system.
Takes about an hour to remove the tank, replace all the parts, including the rubber washers to mount the tank, and reinstall.
Careful not to overtighten those mounting bolts!
John Alden
The water goes down the drain. The tank flapper is leaking and it leaks into the bowl, not on the floor. That would be the washer that would let it leak onto the floor.
a
Put food coloring in the tank water and i bet the bowl will turn the same color within minutes
It could be as simple as the flapper chain is too short because it's knotted up or the flush handle is not allowing the flapper to drop all the way.
Or some object is preventing the flapper from making a good seal.
champer
It's going into the toilet bowl, you've not noticed it because it's a slow, smooth, gentle flow from a leaking flapper. The level in the toilet bowl is not increasing because any surplus water goes over the bend into the drain.
Spock (rhp)
the most likely problem is the flapper valve at the bottom of the tank. less often, the seat for the valve becomes damaged. even less often, the overflow tube inside the tank develops a leak and has to be replaced. -- grampa