BioSafe Systems 3600-16 188716000023 GreenCleanFX Liquid Algaecide-17 oz-Green Water-Plantonic Algae, 16-Ounce Safe for fish, Birds, pets and aquatic plants. When used as directed. Continues to work for up to 48 hours after application. Reduces organic build up and odors. Commercial-strength treatment to suppress, control and prevent algae. Even in deeper waters. Will not cause an increase in water ph. Treats up to 2, 500 gallons