Helps clean dirty aquarium. Contains live bacteria to improve development of natural biological filter. Contains 100 million live bacteria per teaspoon. For setting up and maintaining a fresh or saltwater aquarium. One ounce treats 60 u. s. gallons. A Biological Filter Additive Containing Live Bacteria That Improves The Development Of The Biological Filter And Helps Keep A Naturally Balanced Aquarium. 1 OUNCE