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.
Give us a call at (239) 440-1241, to set up an on-site appointment.