Whisper Bio-Bag Filter Cartridges are designed to be the ultimate in aquarium filtration ease. Whisper Bio-Bags contain precisely the amount of activated carbon, combined with a durable and effective polyfiber filter pad for the best mechanical and chemical aquarium filtration. Select the perfect model to fit your Whisper Power Filter. Can be used in either freshwater or saltwater aquariums.
I have compared different filters over the years, and these are clearly the best. When comparing quality, effectiveness, and price, no other filter comes close. I highly recommend these filter cartridges
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