I have a leak in my vinyl, in-ground pool. The pool is 11 years old, indoors, 15,000 gallon and I keep the cover on it most of the time. This is the second leak in 14 months. Last year trying to fix the leak, I had the fiberglass steps re-caulked, a new gasket for the skimmer, a new gasket for the floor drain, a new gasket for the light, and finally a patch for the very small hole in the vinyl near the return jet. They put a nice patch on that leak.
This year the water leaks about 3/4" per day till the water level reaches 1 1/2 inches below the return jets and stays there. The water leaks till that point if the pump is running or not. As the water approaches this level, the rate of loss slows.
The fellow who finally found last year's leak by the returns could not find the leak this year. He used food color and syringe.
His thinking was to drain the water about 3 inches below where the water stops leaking and re-caulk the steps.
Any suggestions or comments would be much appreciated. Very frustrated.