I had my pool redone in 2020 with pebble and glass tile and wondering if I made a huge mistake. I stay on top of my chemicals probably 80% of the time and over the 4 year period I have developed the impossible removal of the calcium on the waterline. Ive tried just about everything other than bead blasting as I would rather not go that way yet as it's only been 4 years and I never had this issue with my old porcelain tile. Is glass tile more prone to picking up the calcium and sticking to it like glue? I used scaletec and also diluted acid and not much luck in the way of removing? Is bead blasting the only way to really get stubborn line off the tile? Not only is the cost (quoted 1k) to bead blast but I had done it before with my old tile and some of the grout was blasted out as well and don't want to deal with another issue... Suggestions?