Clorox Pool & Spa Shock Xtra Blue is a powerful 6-in-1 formula pool shock treatment that makes maintaining crystal-clear pool water easier. Each box contains 24 individual 1-pound bags of fast-dissolving blue-green granules with algae-killing crystals. The product kills and controls green, black, and mustard algae while eliminating bacteria in swimming pools.

The shock treatment works quickly, allowing swimmers to return to the pool in as little as 15 minutes after application. Each 1-pound bag treats up to 12,000 gallons of water. The formula does not impact pH levels and helps clear cloudy water, reduce chlorine odor and eye irritation, remove swimmer contaminants, and improve overall filter performance.

The active ingredients include sodium dichloro-s-triazinetrione (63.05%) providing 39% available chlorine, plus copper citrate (0.26%) for enhanced algae control. The product also contains an inorganic salt, clarifier, and boron salt to optimize water clarity and treatment effectiveness. The granules dissolve quickly in water and should always be added to large quantities of pool water, never the reverse. Store in a cool, dry, well-ventilated area away from other pool chemicals.