I'm not sure about the difference between these brands but there is a difference in types of carbon in their surface area, pore size and the amount of dust present. These factors can affect how affective the carbon is in the system. BRS describes the differences in the 3 types of carbon they sell at
http://www.bulkreefsupply.com/store/products/carbon-and-gfo/bulk-carbon. There is also a video on this page as well.
I just noticed that the carbons listed were the same as from BRS.
Edited by bfessler - April 11 2011 at 8:14am