Robelle 1-1405M 5-in-1 Multi-Purpose Pool Sanitizer, Tablet, Chlorine, 5 lb

84.65% Available Chlorine 8 oz. Tablets Individually Wrapped Add 16 ounces per 10,000 gallons per week or as often as need Sanitizer, Clarifier, Stain Inhibitor, Algae Control, and Descaler