Fluval BioMax Replacement Media for U2, U3, and U4 Series Underwater Filters provides an optimal environment for biological filtration. Each ring has a complex pore system that allows beneficial bacteria to thrive, helping to reduce and control ammonia and nitrate.

• Provides optimum biological balance
• Complex pore system supports colonization and growth of beneficial bacteria
• Reduces and controls ammonia and nitrate
• Replacement bio-media for Fluval U2, U3 and U4 Underwater Filters

Directions: Rinse before using. Safe for freshwater, marine, or reptile habitats.