Phil,

Are you talking about the biochips? If so here's an interesting thread on it. I believe there are surface area specs listed for biochips, mb3, kaldness, and AA.

http://aquaponicsnation.com/forums/topic/8583-new-bio-media-mutag-biochips/


If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.