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

Compatibility: 

• U4 Underwater Filter

Item #: A492