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flavoraid said:
You could even do rye flour instead of brown rice flour and coffee grinds (spent) instead of vermiculite.

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RogerRabbit said:
I've tried the brf tek with many substitutes for vermiculite, and so far, nothing comes even close.  I've used sand, sandy loam, peat moss, ground perlite, sawdust, compost, coffee grinds, seaweed, and a few I can't remember right now.  Even with wood decomposing species, a 50/50 mix of verm and sawdust in the brf tek is superior to brown rice and sawdust alone.

The point is that verm isn't inert and needs to be treated as such.  It's not something to argue about, just something to understand and take into account.
RR

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