Pool Care Black Algaecide | Quart Bottle

Black Algaecide is a concentrated liquid algaecide for swim pool water. When used as directed, it will kill and prevent the development of green algae, black algae, square D algae, blue-green algae and other swimming pool algae. Usage: Use 5 ounces of Black Algaecide per 10,000 gallons of pool water when first filling the pool for the season. If there is visible algae present in the pool, this dose should be repeated within 48 hours after the killed algae are removed from the pool. For maintenance, use 1 ounces per 10,000 gallons of pool water.