Calcium Buildup: The Truth About Pool Tile Scale

White crust tracing your waterline or caking your spa spillway isn’t a mystery—it’s chemistry meeting heat and evaporation. We unpack what’s actually sticking to your tile, how to tell calcium carbonate from calcium silicate with a quick acid test, and why that difference changes everything for removal time, cost, and results. If you’ve ever cleaned for hours only to see the ring return, this is your field guide to fixing the source and not just the symptom. We start with the real drivers: L...