500 grams

Fluval BIOMAX bio rings have a complex pore system creating an optimal environment where beneficial bacteria can thrive. BIOMAX bio rings have more capacity than most biological filter media and allow ideal water movement throughout the media to ensure optimal contact time for efficient biological filtration. BIOMAX also reduces and controls ammonia and nitrate.
Key Features :

Bio rings with complex pore system create optimal environment for beneficial bacteria to thrive
More capacity than most biological filter media
Allow ideal water movement throughout the media to ensure optimal contact time for efficient biological filtration
Also reduces and controls ammonia and nitrate
For freshwater and marine aquariums