The builder was 100% sure the crack was causing the leak and I had the pool filled again. 1 day later we were down 1 inch again. So I ask the service dealer to check the pool and the first thing he did was pressure testing the 4 returns which are sitting in the side wall. And what a surprise they don’t hold the pressure. I called the builder today to inform him on what we found let see what he has to say about this. If they have to jack hammer the deck out to fix it then I will get crazy. I will keep you guys posted