Fluval Stage 3 Biomax Replacement For U2, U3 & U4 Underwater Filters
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.
Directions: Rinse before using. Safe for freshwater, marine, or reptile habitats.