Doheny"s Super Algaecide Plus treats up to 160,000 gallons with super strong algaecide that even kills persistent yellow mustard algae. This powerful formula with 7% chelated copper prevents all common algae growth, and stubborn green, mustard, and black algae. It will not foam or cloud water and is effective in all parts of the country. Recommended dosage: 2 oz. per 10,000 gallons water.