7.2LB Green To Blue Shock

HTH, 7.2 LB, Green To Blue Super Shock System, Quick Dissolving, Kills Bacteria & Controls Algae, Restores Water Clarity, All In 1 Chlorinates, Shocks & Kills Algae, Transforms Water In 24 Hours, Drops Particles To Bottom Of The Pool, Makes Particles Easy To Vacuum To Waste.