Bio3 Whisper Filter Cartridges Regular 24 pk

3-stage filtration in a single cartridgeBaffle floss bag prevents carbon from settlingClamshell frame locks securely to contain mediaDisposable, baffle floss/carbon bag provides mechanical and chemical filtration and prevents carbon from settling. Also includes one reusable aerobic sponge for superior biological filtration and one reusable clamshell frame for easy slide-in installation in Drs. Foster and Smith Bio System Power Filters and Whisper filters. Junior fits Bio System Power Filter Model 15, Whisper E, Jr, 10, and Whisper In-Tank Filters 10i. Regular fits Bio System Power Filter Model 25, 35, 55, 75, Whisper C, 1, 2, 3, 20, 30, 40, 60, and all Triad filters.Please click on "More Information" for installation instructions.