Arizona's tap water is among the hardest in the country. Every gallon carries dissolved calcium and magnesium picked up from the limestone and granite our groundwater flows through. In the Greater Phoenix area, hardness routinely tests between 12 and 25 grains per gallon — well into the "very hard" range.
Here's what that means for your pool. Under our relentless sun, pool water evaporates fast. The water leaves, but the minerals don't. They concentrate at the surface and bond to the tile right at the waterline, where wet meets dry. Over months, that thin chalky film hardens into a crusty white scale — calcium carbonate, and sometimes the tougher calcium silicate on glass tile.
Homeowners try everything: pumice stones, acid washes, scrub brushes, off-the-shelf scale removers. The problem is that calcium carbonate is nearly as hard as the tile itself. Pumice scratches the finish. Acid can etch grout and dull glass. And scrubbing barely touches silicate scale.
The method that actually works is controlled media-blasting. We use soft kieserite media at a low 60–100 PSI — hard enough to shatter and lift calcium, soft enough to leave tile, glass, and pebble untouched. It restores the original surface in a single visit. A complimentary sealant afterward slows how fast the calcium comes back.
Calcium isn't a sign of a neglected pool — it's simply Arizona chemistry. The good news is it's completely reversible when it's removed the right way.
Ready to get your tile back?
Kieserite media-blasting, full sewer vacuum, and complimentary sealant — across the Greater Phoenix Valley.
