Fluval U4 Poly-Carb

Poly-Carb Cartridge for U4 Underwater Filter, 2-Pack
 
Specifically designed for the Fluval U4 filter, the U4 Poly-Carb Cartridge has two unique filtering sides that combine to provide thorough chemical filtration.
 
Features
 
Chemical filter media
Polyester side filters out fine debris and contaminants
Carbon side filters out harmful liquid substances, colorants and odors
Suitable for freshwater, saltwater or reptile environments
Convenient 2-pack format
2 x poly/carbon cartridges included