Fluval Bio Foam Replacement Filter Media Pad for FX2 Aquarium Canister Filter

A custom-fit Bio-Foam insert made for the Fluval FX2 canister filter. This foam block has a porous structure that performs double duty: it mechanically strains out debris and particles, and its specialized “bio-foam” design provides an expanded surface area for colonies of nitrifying bacteria. Installing or replacing the Bio-Foam helps maintain effective filtration by ensuring solid waste is trapped and beneficial bacteria can thrive to keep ammonia and nitrite in check. It’s an essential part of keeping the high-capacity FX2 filter running at peak performance and your aquarium water clean and safe. (Fluval FX2 Bio-Foam Filter Insert)