So I've got a serious leak in my pool. The pool was built around 1980 using what i think is a somewhat unusual design. I haven't seen another like it anyway. It's gunite on the bottom with a steel/concrete reinforced fiberglass wall.
In any event, I've plugged the skimmers and three return eyelets. I haven't closed the valves at the pad, do I need to do that to?
Do I need to swim down and block off the main drain somehow as well?
My plan is to measure the loss compared to the bucket over the next 12-20 hours and document that information. I'm concerned its in a return line and I'm also concerned I had multiple failure points. Anecdotally I don't notice loss when the pump isn't running but I need to capture data methodically and go from there.
Any other steps I should be taking?
Here's a picture of the pool. It's worth noting that several years ago it wasn't winterized properly and the deep end skimmer line was damaged rendering that skimmer inoperable (this is why we can't have nice things). It's permanently sealed off at this point. I'd like to return that to functional but I need to find the leak first.