Tetra Whisper Unassembled Bio-Bag Filter Cartridges Size: Large, 12-Pack, Easy-to-maintain aquarium, New!!! Go to amazon.com Related posts Top 12 best tetra filter large: Which is the best one in 2022? FeatureEasy to Assemble, Easy to Replace DescriptionWhisper bio-bag cartridges complete the Whisper power filter package for a clean,