Fluval U3 Poly-Carb

Poly-Carb Cartridge for U3 Underwater Filter, 2-Pack
 
Specifically designed for the Fluval U3 filter, the U3 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