Robelle 3" Chlorine Tablets, Clarifier, Super Mineral, Black Algaecide, Shock, Clarifier Swimming Pool Chemical Kit For Pools Up To 30,000 Gallons 50 lbs. Robelle Jumbo Tabs - 90% available chlorine, dissolves correctly, and maintains proper free chlorine. 12 lbs. Powdered Robelle 68% Cal Hypo - for a quick chlorine boost after heavy usage, extreme heat, and during periods of algae growth. 12 lbs. Robelle Oxidizing Shock and Swim - kills contaminants without affecting free chlorine and pH 1 qt. Robelle Black Algaecide - treats and prevents all algae. 2 qts. Super Mineral Stain and Erase - sequestering agent that will prevent staining.