On a related note (related to the builder seemingly not knowing what the heck he is doing):
- Does your deck overhang the edge tile? Hopefully it's just the photo, but they look flush.
- Is there an expansion joint between the deck and the tile? (Again, could be the photo, but I'm not seeing one.)
- Is there an expansion joint between the deck and that block wall?
- Does the deck slope away (down) from the pool's edge? Put a level on it.
- And where would that water drain to? If the deck is level, or sloping back into the pool, that's wrong.
- Are the other control joints in your deck as crooked as the one in your pic?
Sorry to pile on, but these concerns are what I'm seeing just from a pic of 4' of your new pool! I hope the rest of your pool was built correctly...
Familiarize yourself with these pool-construction/concrete necessities so that you can discuss them with the inspector. And unfortunately, you cannot always rely on inspectors spotting everything, even major mistakes. A lot of them are just lazy, and/or not particularly experts at pool construction, which is quite a departure from home construction.
Again, hold that final payment until you are 100% satisfied that everything about your pool is proper and up to code.