Designed specifically for the Fluval 107 and 106 performance canister filters, 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. Premium Biological and Mechanical filtration Rippled 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