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HTH (high test hypochlorite) 3 In. super 4-in-1 chlorinating tablets sanitize, protect against the sun, controls algae, and clarifies. For use in feeders. Designed to dissolve slowly. Active ingredients: Trichlors-S-Triazinetrione 93.6\%, zinc sulfate monohydrate 3.5\%, other ingredients 2.9\%, available chlorine 84\%.