Not sure if this is where to get advice. I had a pool installed 2 years ago by a national provider. The one who is on TV and has all the shows. Well now I am having issues with the deceptive tiles that were installed. I have travertine and instead of using plaster to build up the back to match the thickness of that tile for the deceptive tile, the just put globs of plaster on the back of each tile and the put grout in. The grout is falling out because it isn’t attached to anything. They are telling me that is the way tile is installed in pools. The tiles are now falling out. Below is a picture of the does anyone know if this is standard practice? It seems I am in for thousands of dollars to have of the tiles removed and installed correctly. This section is where the spa waterfall flows into the pool.

