I will be setting up my IBC system this May, and have a question about matting used for filtration and bacterial growth. I saw this matting on Practical Aquaponics video and went to Home Depot and Lowe's where they had NO idea what I was talking about. I showed them photos, and they still had no idea. Does anyone know what this material is called? Here is a photo on my Flickr account:

http://www.flickr.com/photos/ben_marko/ ... hotostream