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Amazon.com : In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms- 24 X 1 Pound : Patio, Lawn & Garden
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HTH Pool Care Shock Advanced, Swimming Pool Chemical Prevents Bacteria & Algae, Cal Hypo Formula, 1 lb (Pack of 12) - Walmart.com
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Amazon.com : In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms- 24 X 1 Pound : Patio, Lawn & Garden
Leslie's Power Powder Plus 73% Calcium Hypochlorite Pool Shock 1lb Bags 12-Pack | Leslie's Pool Supplies
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