Fluval U2 Poly-Carb Cartridge has two unique filtering sides that combine to provide thorough and effective chemical filtration, the crucial second stage in the filtration process.  For use in the Fluval U2 Underwater Filter

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