Give your fishies a clear swimming environment with the quiet Tetra Whisper Internal Power Filter with BioScrubber. The submersible filter includes a 3-stage filtration system with a dual-sided Bio-Bag mesh， which catches debris and fish waste while the activated carbon absorbs odors and discoloration. The bio-scrubber features an anti-clog design for convenient and easy maintenance. The bio-scrubber also has a solid back， which pushes the water making it flow evenly over the bacteria-rich bristles for supreme performance. This filter is compatible with Tetra Bio-Bags for easy and reliable maintenance.