OK - I've searched and searched on Google and in the forums and I see tons and tons of references to "pool grade" DE and to "food grade DE" and I get that. What I can NOT find is where the DE you buy for the garden, we got a bag at Lowes, falls on that scale. The bag never uses the words "food" or "pool". I have called every feed & hardware store, even tried the local health food store, and no one has food grade DE available. It's rare that you can't find some sort of good answer via Google - so I hope that someone here will have an answer.