Where we mention In The Swim Pool Shock - 68% Cal-Hypo Granular Sanitizer - 12 x 1 Pound

• Why Is My Pool Still Cloudy After Shocking?

  Re-shock with cal-hypo · Best for: Re-shocking at dusk when FC keeps falling to zero overnight; cal-hypo does not raise CYA

• How to Get Rid of Mustard Algae in a Pool (Brush + Shock Protocol)

  Cal-hypo shock for the breakpoint step · Best for: The ratio-driven breakpoint shock. Adds calcium while it oxidizes, so check calcium hardness first.