Bio - life Balls 5 Cubic Feet (3000pc) (Catalog Category: Aquarium / Filter Media) America West Plastics - Bio-Balls 3000 Pc Aquarium: Filter Media America West Plastics 5 cu ft Bio-Life Balls Bio Balls offer excellent surface area for beneficial bacteria growth as well as a non-channeling design Bio Balls are state of the art filter media for use in your freshwater or saltwater wet dry systems