Convenient all-in-one bag/frame unit ensures exceptional mechanical and biological filtrationUltra-activated Whisper Filter Carbon removes chemicals, colors, and odorsNow 50 percent more carbonDisposable, easy-to-use Thick n' Fluffy filter bags provide exceptional mechanical filtration as they effectively trap unhealthy particulate matter. Bags fit snugly around the patented Aerobic Frame, which increases filtration surface by 200 percent and provides beneficial biological filtration by culturing and maintaining helpful bacterial colonies. NOT for use with Whisper EX Power Filters.Ultra-activated Whisper Filter Carbon, for use in each Bio-Bag, contains seven absorbent acres of surface area per ounce. Millions of micropores within each granule absorb and lock in discoloration, noxious odors, dissolved contaminants and hundreds of other chemicals such as chlorine, insecticides and detergents.SizeFits3i1.5 gallon Water Wonders AquariumsMedium (formerly Junior)Whisper Power Filter 10 and Whisper In-Tank Filter 10iLarge (formerly Regular)Whisper Power Filters C, 1, 2, 3, 20, 30, 40, 60 and all Triad filters and Whisper In-Tank Filter 20i and 40iExtra LargeWhisper Power Filters 4 and 5Please click on "More Information" for instructions.

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