DLK1009: Features: -Aquarium and pond filter accessory. -Available in 30 Ounce, 60 Ounce and 135 Ounce sizes. -Color: Green. -Special formulation two most essential elements necessary maintain healthy aquarium. -Removes toxic matter from fish waste and food, which causes foul odors and cloudy water. -Green granules specific type of zeolite uniquely suited to removal deadly ammonia. -Regular use provides increased efficiency of filtration. -Helps keep water odor free and prevents cloudiness. -Made in United States.