Promotes growth of beneficial bacteria
Fits the Fluval U2, U3 and U4 Filters
Replenish only half at one time
Works in freshwater or marine environments
Fluval BioMax provides an optimal environment for beneficial bacteria growth. The bio rings have a complex pore system creating an optimal environment where beneficial bacteria can thrive. It also reduces and controls ammonia and nitrate. Fluval BioMax is for freshwater and marine environments, and fits the U series filter models: U2,U3 and U4.
Fluval U Underwater Filter BioMax - B001XRR2IM