The Fluval Bio-Foam Max was designed specifically for the Fluval 06/07 series performance canister filters, Fluval Bio-Foam Max is a 2-in-1 biological and mechanical media that features a rippled surface pattern offering up to 30% more area for effective filtering of waste and debris.Fluval Bio-Foam Max 06/07 Series+ premium Biological and Mechanical filtration+ pippled surface pattern offers 30% more area to efficiently trap waste and debris+ prevents premature clogging extending life of subsequent filter media+ complex foam construction helps maintain even and consistent water flow+ ideal surface for growth of beneficial, nitrifying bacteria+ custom fit with no gaps to maximize filtration efficiency+ convenient 2-pack format+ replace every 6 months+ for use in freshwater and saltwater aquariums