Interferes with essential metabolic activities in algae cells * Kills all algae in pools including "Black algae" * Algaedyn is compatible with most other chemicals normally used in the maintenance of swimming pools * Algaedyn improves the effectivness of your chlorine * Recommended Dosage: Use 1/2 qt. per 10,000 gal. Pool for Infested Pools, 4 oz. Weekly Maintenance