I've spent days trying to remove calcium buildup from my tile. I used up 2 pumice stones. I tried a mixture of muriatic acid and water in a spray bottle, which seemed to help a little (very little) but also looked like it was eating the grout away too. I went to a Leslie's pool supply and they sold a product to me called Ultimate Rapid Scale Remover, which doesn't list the ingredients on the bottle. I watched a youtube video of someone cleaning pool tile and they used a razor scraper to scrape the worst calcium off, then used a product like Leslie's has, covered it with plastic wrap to keep the product from drying out, then the calcium came off easier when the plastic wrap was removed. I tried that and left the plastic wrap over the wet tile all night and this morning the calcium is no easier to remove. The pumice worked the best but it's ridiculously slow. The razor scraper works but it's about as slow as the pumice stone. I'm about to give up. My pool is about 16 years old and has never had the tile professionally cleaned and the grout is not flush with the tiles. I wonder - should I have the tile professionally cleaned AND have the grout redone together? If so, does anyone know the approximate cost of such a project? Or are those totally separate projects performed by different types of professionals?