Tetra Whisper Filter Cartridges complete the Whisper Power Filter package for a clean, easy-to-maintain aquarium. Filled with Ultra-Activated carbon, the ready-to-use disposable single packs remove waste particles, odors and discoloration.
The Whisper Filter Cartridge medium multi-packs come unassembled and offer economical pricing on larger quantities.
Whisper EX Carbon Filter Cartridge Medium fits Whisper Filter X20
It is recommended that you replace your Whisper Filter Cartridge when water begins to overflow excessively from the Wonder Tube chamber.