I use Azomite in my garden. Heard about it on youtube. Searched online to buy it, but shipping was outrageous. Found it at a nursery, under $30 for about 50 lbs. and that included their shipping costs. I'll be following this topic, as sooner or later, some more refined recipes are bound to show up including ingredients and quantities. I am curious about using spent brewing grains. I used to brew and when the grain was done with the sparge process, there was no sugars or taste to the clear water coming from the sparge tun. Is this used as strictly a filler to make volume? Thanks all! aquaally