Have you heard of or used alginite as a substrate? I'm not sure you can buy it in the States as a friend of mine in Hungary told me about it upon hearing about Sean's substrate. In Hungary all the soils you can buy are 90% peat and 10% fertilizer. Here is a link for more info:
http://www.alginitbio.hu/html/alginit_kft.htm
Do you think it would work as a substrate with similar results to Sean's concoction?
alginite
alginite
Viktor