Tetra Bio Bag filter cartridges make clear water simple. Designed for use with the Tetra Whisper 3i In-Tank Filter, they keep water crystal clear, remove odors and discoloration, and are extremely easy to use.
Bio-Bag cartridges are tough on the debris that makes aquariums nasty. Ultra-activated carbon absorbs odors and discoloration better than competing brands. Dense, dual-sided mesh catches debris and fish waste, and each cartridge features more mesh than other products. Convenient, pre-assembled Bio-Bags are ready to use. Simply open, rinse, and place in your Whisper Power Filter.
Fits: Whisper In-Tank Filter 3i.