Fluval Bio-Foam Filter Pad FX Series 2PK

Fluval Bio-Foam for the FX series filter is uniquely designed to allow maximum populations of beneficial bacteria and should be used in conjunction with Fluval Fine Pads to optimize the purity of aquarium water. For freshwater and marine environments. Fluval FX series Bio-Foam Filter pad replacements should be changed approximately every 6 months, though they can be rinsed clean between filter changes to extend filter life.