2.5 years ago we had a pool built. Ended up going with the most expensive of the bids because the company had been in business for the longest (by far) and we felt the owner was a "straight shooter" and genuinely came across as knowledgeable. As they built the pool in spring and we're extremely busy (along with all the pool builders) I didn't feel like we got the best pool they had built (they used sub contractors for most of the build). Some small issues with concrete and the pool equipment install. But nothing that was "end of the world" and we decided not to make an issue out of them. Fast forward to October 2020 we discovered a rusty crack near the deep end of the pool which was about 5' long (vertical). Immediately called the builder and they advise is to shut off the make up water and they would have someone out to repair the following week. In 5 day the pool level decreased by 4'. They pumped out the remaining water and returned the next day to repair. They cut a 3" wide x 5' strip out of the pool (found rebar about 2" from the surface) and installed the pebble tec finish as the solution. They also discovered a crack in the other side of the pool and patched that. Obviously this is probably not going to be the ultimate solution as the patch does not match and I believe the is a structural issue and that the pool will continue to crack as we have not addressed the reason for the initial issue. We are being extremely patient as they have let me know that they are the experts. As I am a boiler service tech (combustion and instrumentation) I am familiar with most aspects of construction from the dirt to finished product and have a fair bit of common sense. That being said, I would say that a pool is not supposed to crack and if it does they need to address the structural issues and once that is complete (from a licensed engineer) then they need to completely resurface the pool. I don't feel that is unreasonable, what do you think? (And they have a structural guarantee in the contract and on their website)