Fluval BIOMAX Bio Rings Filtration Media

Fluval BioMax rings are unique, inert ceramic rings that promote powerful bacterial growth both internally and externally. Each ring is very porous, with holes that are perfectly sized to host beneficial bacteria.
Inert ceramic media rings
For all external filters
Provides superior biological filtration
The massive internal and external surface areas allow huge colonies of beneficial bacteria to grow, making Fluval Bio-Max an ideal media for biological removal of both ammonia and nitrite concentrations in the aquarium.