Sludge removing system for salt water. Beneficial pro-biotic bacteria. Reduces aquarium maintenance! Provides a naturally cleaner clearer and odor-free environment by the reduction of organic particles caused by sludge excess proteins uneaten food and fish feces. Keeps marine aquariums looking crystal-clear! Increases ozygen availability. The most effective method to reduce maintenance and be sure your biological filter is operating at its optimum best. Five different strains of high density bacteria for full spectrum sludge elimination.