BIOMAX nodes feature a complex pore system where beneficial bacteria can easily establish and flourish. The media shape is specifically designed to permit even water distribution, which prolongs contact time over a wider area for effective biological filtration. Premium biological filter media Complex pore system provides large surface area for thriving beneficial bacteria growth Promotes ammonia and nitrite reduction Permits even water distribution, prolonging contact time for added biological filtration For best results, replace every 3 months For use in freshwater and saltwater aquariums