Fluval - Blue BioFoam MAX for Fluval 407 - 2 pk

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