Yes it's waterline in pool and spa as 1x2 plus spillway as 1x1.I see a lot of glass tile popping off. It's always the mesh backed variety with poor thinset beds.
Is this just for the waterline?
This tile comes attached to clear film in front instead of the mesh in the back. The manufacturer specifies 6 allowed brands of thinsets.
Glass Tile Water Feature Installation | Aquabella Tile