Fluval Clean and Clear Replacement Filter Cartridge for U1 U2 U3 U4 Aquarium Filters - 2 Pack - Perfect for Freshwater Fish Tanks and Aquatic Pets

The Fluval Clean & Clear cartridge is packed with special high-performance resins, proven to reduce phosphate and nitrate for a cleaner, clearer aquarium and healthier fish. Add to the central Fluval U cartridge alongside the Biomax.

• Helps keep water beautifully clear
• Extends time between water changes