Rookie Pool Chemistry Mistakes Pt.1 – Bob Lowry

Algae keeps coming back even when your test reads “plenty of chlorine”? Here’s the missing piece: cyanuric acid quietly ties up most of your free chlorine, leaving only a small slice as active HOCl. We dig into the real chemistry behind clear water, then translate the math into one simple rule you can use on every stop. We walk through the practical percentage target that actually prevents algae: set free chlorine to 7.5% of your CYA, or drop that target to 5% when you run borates at 50 ppm....