Fluval FX Bio-Foam

Bio-Foam+ for FX2/FX4/FX5/FX6 Canister Filter, 2-Pack
 
Designed specifically for FX2, FX4, FX5 and FX6 high performance canister filters, Bio-Foam performs double duty as both an effective mechanical and biological media.
Compatibility
FX2/FX4/FX5/FX6 Canister Filter
Features
Mechanical/Biological filter media
Dense structure ideal for trapping small particles
Intricate, porous network provides vast surface area to facilitate growth of beneficial bacteria
Helps create clean and healthy water conditions
For use in freshwater and saltwater aquariums
Convenient 2-pack format
2x bio-foam pads included