I closed my pool this fall (we live in Canada) as I have done the past four years in September. Noticed in late November the water level seemed to be down. It was tarped but I could see it was begining to look stretched. I had lowered the water level below the jets and return and blown out the pipes. I suspect the leak is either to bottom drain or around the stairs.
So this is what I was going to do in the spring:
Once it is untarped, perform a bucket test to see if it is still leaking, if it is not, raise the water level until it does. Then I have (roughly) found the leak.
However if it is still leaking what is the best way to test the main drain at the bottom of the pool?
I'm hoping I can get the water clear enough then blow air through the return and see if there are bubbles around the edge of the drain where they should not be. I could also pump the water down to a few inches deep and do some dye tests.
If it turns out the leak is around the drain should I attempt a fix myself, or call somebody? I would assume that any leak would either be the gasket or the drain itself. If it is the drain I'm guessing the only way to fix it is to pull the liner and jack hammer the thing out, or just plug the bottom drain and not use it.
If it is the gasket I guess I shoud leave some water in the pool to keep the liner in place then replace the gasket?
Any advice would be greatly appreciated. The pool is only 5 years old so is modern in construction.