API Bio-Chem Zorb for Superclean Filter Bio-Chem Zorb is the ultimate filtration medium for crystal clear water. It removes organic aquarium pollutants, including colors, odors, heavy metals and toxic gases as well as other compounds. Bio-Chem Zorb is also capable of removing light blocking impurities to improve growth of corals in saltwater and plants in freshwater aquariums. Product Features: Removes organic pollutants and light blocking impurities Easy to use and install Can help to improve growth of corals and plants Helps removes compounds carbon alone cannot remove Item Specifications: For use with the Superclean Power Filter (780A 5-20) 3 pack or 6 pack Size: 20 Gal 30 Gal 50 Gal