Whisper Bio Bag Disposable Filter Cartridges keep your aquarium water crystal clear, help remove odors and discoloration, and are economical and easy to use. Whisper Filter Cartridges provide superior mechanical and chemical filtration for your aquarium. Dense, dual sided mesh catches debris and fish waste. For superior and easy aquarium filtration. Designed for the Whisper 3i In-Tank Filter and the Marineland 1 1/2 Aquarium Kits.
Does not do the job Needs to be changed in aprox 5-6 days
Used for 2 Years 12/6/2012
I used Tetra whisper bio-bag filters, size small, for over two years in a 1.5 gallon tank. The filters would keep the water clean for 1 week. After getting tired of dumping & cleaning the tank every week, I am now looking for a larger tank that doesn't need so much cleaning. But these filter systems are good for a starter tank (about $16/month).