Whisper Unassembled Bio-Bag Cartridge Large (8 pack) Whisper Bio-Bag Cartridges complete the Whisper Power Filter package for a clean, easy-to-maintain aquarium. Filled with Ultra-Activated carbon, the ready-to-use disposable single packs remove waste particles, odors, and discoloration, and are easily changed once a month. The Whisper Bio-Bag multi-packs come unassembled and offer economical pricing on larger quantities..
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