For the ultimate in convenience, choose this 3-Pack of Assembled Whisper-« Bio-Bag-« Cartridges. Offering the same protection as the traditional Bio-Bag-«, the 3-Pack is packaged in a color-coded carton, making it easier than ever to remember which cartridges to purchase. Replace your Whisper-« Bio-Bag-« Filter Cartridge once a month, or when water begins to overflow excessively from Wonder Tube-« chamber.
Selection of the store only applies in the cart/checkout.
