How do I remove calcium deposits from my tile?

Calcium deposits usually originate from grout or setting mortar. To remove, scrape it off the tile. Another method for removing calcium deposits is the pumice stone. Pumice is a light porous glassy lava stone that can be rubbed over a pool stain to remove it. You can get a pumice stone that can attach to your telescopic pole or a pumice stone that has a handle you can swim with.