Fluval Canister Foam Filter Blocks Fluval Foam Inserts capture large particles for effective mechanical filtration, the crucial first stage in the filtration process. Custom fit to prevent bypass, they have a pore size that allows efficient water flow with less clogging for long-lasting filtration. These inserts also enhance biological filtration. For freshwater and marine environments. Uniquely designed to fit Fluval Canister Filters.

• Photo Does Not Represent the Actual Size