Key features

• •REPLACEMENT FILTER MEDIA: These Activated Carbon Cartridges are specially designed for the Cascade 400 Fully Submersible Internal Filter (CIF2), and serve as a replacement for when it's time to cycle out aquarium filter media.
• •TOP-QUALITY ACTIVATED CARBON: These Activated Carbon Cartridges come together in a 2 Pack. For best results, replace cartridges every 4 to 6 weeks. With that said, they are refillable, allowing you to customize filtration based on your aquarium's needs.
• •CHEMICAL FILTRATION: In addition to absorbing ammonia, nitrites, nitrates, and phosphates in a timely manner, these Activated Carbon Cartridges also remove harmful chemicals and toxins, clear up discolorations, and reduce foul odors from your tank.
• •MEASUREMENTS: 2.5" (D) x 2.1" (D) x 1.5" (H) each.
• •SHOP PENN-PLAX FOR ALL YOUR PET'S NEEDS: Penn-Plax is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small.