This is by far the best bought bulk substrate I've had the pleasure of growing/experimenting with. I've tried numerous times to duplicate the substrate and results to no avail. Whatever it is you guys are doing is working, so keep it up. Also, I have yet to experience any contamination problems as well when using this, so pasteurization is superb, unlike many other mycology suppliers out there. I will vouch for this bulk substrate any day.
-Clay