Penn-Plax Cascade 100 GPH Hang On Filter Aquarium Bio Sponge Replacement; 1 Pack
Struggling with a sluggish or ineffective aquarium filter? The Penn-Plax Cascade 100 GPH Hang On Filter Bio Sponge Replacement is an effective upgrade that restores your filter's cleaning power fast. It delivers dual biological and mechanical filtration, fits Cascade hang-on-back models precisely, and uses fish-safe foam that holds up through repeated rinses. A simple swap keeps your tank water clear and your fish healthy. Available on Amazon.