Whisper Bio Bag Small 2 Pack 1.5 Gal Kit

For the ultimate in convenience, choose this 2-Pack of Assembled Whisper® Bio-Bag® Cartridges. Offering the same protection as the traditional Bio-Bag®, the 2-Pack is packaged in a color-coded carton, making it easier than ever to remember which cartridges to purchase on subsequent trips to your local aquarium store.

Replace your Whisper® Bio-Bag® Filter Cartridge once a month, or when water begins to overflow excessively from Wonder Tube® chamber.