The Whisper Bio-Bag 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 & External Power Filters E, J & 10.
Large fits Whisper 20i, 40i & External Power Filters C, 20, 30, 40 & 60.
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