Aquarium Fish Tank Filter Cartridges Tetra Whisper Disposable Assembled Bio-Bag Large 3-Pack

Keeps aquarium water crystal clear – removes odors and discoloration.
Dense dual-sided mesh filters debris and fish waste.
Colour-coded to make it simple to remember which replacement cartridge size to purchase.
Replacement filter cartridges are fully assembled and ready to use.
Change monthly or sooner if needed.