On a 15yr old IG, Typically is main drain plumbing encased in gunite/concrete? I know the skimmer and about first 3' or 4' is encased(I have that part exposed) I just wondered if that is the case all the way down to both my main drains?
If so?, hypothetically, If pool was to drop/sink, wouldn't main drain plumbing drop with it?
Has anybody ever heard of main drain plumbing(from drains to skimmer, not from skimmer to equip) leaking do to pool sinking?
Also, Whats the best way to test light nook for leak?