Tetra Marineland Bio Foam Grid Fits Whisper In Tank 20-40

Tetra Whisper Bio Foam Grid replacement kit. Bio Foam provides an extreme amount of surface area for optimal biological filtration in the Tetra In Tank Whisper power filters. The Bio-Foam Grid fits the Whisper In-Tank 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. BioFoam and Grid - PF 20i/40i (In tank) Royal Item Number: ATS25997