Hi Greg! yes it is fiberglass wall and concrete floor construction although the concrete was not applied as you would gunite - it's pretty old and from the looks of it was done the old fashioned way

We don't have a problem anywhere else in the pool except for with the fiberglass LOL
I think next spring we are going to remove the decking around the pool and fiberglass walls and have concrete walls poured -i have yet to hear back from uniwall or other business that specializes in fiberglass wall construction.

i was hoping that coating it with some kind of epoxy sealcoat would help hold the water in for a few seasons - we may be beyond that as a solution to our problem.
thank you!

our water loss has slowed but the level is down to where the fiberglass meets the concrete now.