AIM71256 Bio 3 Cart Penguin 125, 6-Pack

The pre-filled media bags hold the carbon up in the water stream rather than having the carbon pile up at the bottom of the media bag. These bags have made cleaning my filter so much easier. I have used them for years.

these are hard to find and these were vary priced just right, one of the best filters ever made. awesome

easy to use, easy to clean and fits bio wheel filter perfectly. Would recommend to others and will definitely purchase refills.