Crack in spa, efflorescence, popping tiles

Hello, this is our second pool and it is almost three years old. We built a new home and the builder had a pool side of the business and we added our pool through them. They are working with us but I’d like opinions on issues and resolutions. Our spa is built for eight. There’s a crack inside the spa and on the exterior wall mirroring each other. Been growing for a while. The tile top of the spa we e had continuous issues with tile popping off and efflorescence growing through the grout as well. There has been terrible lime scale or efflorescence growing in stalactites along the edge of the tile and the pebble of the exterior spa wall. Builder wants to patch the crack and add in the missing popped tiles but I feel this doesn’t address the underlying cause of what’s happening within the wall. Pix of problem areas and pool as a whole when built. Suggestions opinions welcome.
 

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The correct fix is to strip the plaster and tile along the crack line and see if the crack goes through the gunite wall. If it does, concrete staples will be required to reinforce that area.

Once it is stripped down to the gunite you can assess what repairs are needed and then rebuild the area.

Was any waterproof coating put between the gunite and tiles?

Here is the recommended glass tile installation process from Oceanside Glass & Tile...


https://cdn.shopify.com/s/files/1/0...l-Water-Feature-Installation.pdf?v=1625588595

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