Fluval U4 Underwater Filter Poly/Carbon
Fluval Poly/Carbon Cartridges features two sides for effective chemical filtration, the crucial second stage in the filtration process. The polyester filter pad side filters out fine debris and contaminants. The carbon side filters out harmful liquid substances, colorants and odors. The Fluval Poly/Carbon Cartridge works in part with the Fluval Filter Foam Pad to help keep your aquarium healthy and clean.