6 in 1 shock with algae-killing crystals. Kills and Controls Green, Black and Mustard Algae. Kills Bacteria. Clears cloudy water and removes swimmer contaminants such as body oils, sweat, lotions and urine. Reduces chlorine odor and eye irritation. Improves filter performance. Won’t impact pH. Treat and swim in 15 minutes (Test Free Chlorine before swimming to ensure it does not exceed 4ppm). 1lb Bottle, 6 pack (1lb Bottles).
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