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HTH, 4 LB, Green To Blue Shock, Transform Your Green Water To A Clear, Sparkling Sea Of Blue, In 24 Hours Your Pool Will Once Again Be Blue, 2 Treatments For 5,000 Gallons, 1 Treatment For 10,000 Gallons, Active Ingredient-Aluminum Chloride 100%, 2 Part System: 1-2.5 LB, Green To Blue I & 1-1.5 LB, Green To Blue II.