Tetra Marineland Bio Foam Grid for Whisper In Tank 20-40
Replacement Bio Foam Grid for Tetra In Tank Whisper Power Filters. Provides extensive surface area for optimal biological filtration in the Whisper filter system.
Each kit includes a Bio Foam piece and a plastic frame designed to fit the Whisper In-Tank Power Filter (models 20i and 40i).
| Component | Details |
|---|---|
| Product Type | Bio Foam Grid |
| Compatible Filter | Tetra Whisper In-Tank Power Filter (20i/40i) |
| Kit Contents | Foam piece and plastic frame |
| Replacement Frequency | As recommended by manufacturer’s maintenance schedule |
FAQ
How often should I replace the Bio Foam Grid?
Replace the Bio Foam Grid according to the manufacturer’s recommended maintenance schedule.
Is the foam compatible with both 20i and 40i models?
Yes, the Bio Foam Grid fits both the Tetra Whisper In-Tank Power Filter 20i and 40i models.
Does the kit include the frame and foam?
Yes, each kit includes both the foam and the plastic frame.

Sarah Lee –
The foam grid fits perfectly in my Whisper filter. It’s easy to install and has improved water clarity in my tank. I’ve used it for two months now and the filter performs better than before.
John Stewart –
Works well with my 40i filter. The foam holds up well and the biological filtration has improved noticeably. I follow the maintenance schedule and replace it every 4-6 weeks.
Gordon Manning –
Great replacement for my old foam. The frame is sturdy and the foam provides a large surface area. My tank has been cleaner and more stable since switching.