Penn-Plax Cascade Disposable Floss/Carbon Filter Cartridges.

Activated carbon is great for freshwater aquarium filtration. The Cascade Mini Han-On PowerThe poly-fiber floss barrier screens out particulate matter and debris keeping the water clean. Removes odors and water discoloration by trapping the pollutants in the pores of the carbon. Perfectly measured to fit into the Cascade 20 Power Filter CPF6.