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Whisper BioBag Aquarium Water Filter Cartridges complete the Whisper Power Filter package for a clean, easy to maintain an 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 BioBag multi packs come unassembled and offer economical pricing on larger quantities. It is recommended that you replace your Whisper Bio-Bag when water begins to overflow excessively from the Wonder Tube chamber, or once per month. Small fits Whisper Power Filter 3i. Medium fits Whisper Filter MicroFilter, 10i and External Power Filters E, J and 10. Large fits Whisper 20i, 40i and External Power Filters C, 20, 30, 40 and 60. Replacement filter bags for Whisper Power Filters Regular Size 8 Pack. Disposable filter cartridge. For best results change BioBag monthly. Size: Large. Made in the USA.