Keep your aquarium water clear and healthy with these Fluval Replacement Media Sets, specifically designed for U2, U3, and U4 filters. Each value pack provides up to six months of biological and mechanical filtration, ensuring your aquarium remains clean and balanced. Ideal for both freshwater and saltwater setups, these media sets deliver reliable performance for your aquatic environment. Key Features: Comprehensive Pack: Each set includes: 1 x BioMax (55g) 2 x Bio-Foam 6 x Poly-Carb cartridges BioMax: Supports a healthy nitrogen cycle by reducing .