Tetra Whisper Bio Foam Grid replacement kit. Replacement bio-foam grid for your Whisper power filter. Bio Foam provides an extreme amount of surface area for optimal biological filtration in the Tetra Whisper power filters.
Tetra Bio Foam aids in the biological filtration of your whisper power filter. Each Whisper Bio Foam Kit includes foam and a plastic frame. For best results, replace the Bio Foam Grid according to the manufacturers recommended maintenance schedule.