Cob: Re: diatomaceous earth

[Amanda Peck]

I'll jump in.  There's a big difference between "pool grade" and "food 
grade."  This link says that the pool grade is chemically treated and heated 
  to produce crystalline silica.  Nasty, potentially deadly (worse yet, slow 
death), stuff to inhale.  The plain powdered food grade doesn't seem to harm 
mammals at all, but can be mixed with grain to prevent insect infestations, 
dusted on the dogs as flea powder, and so on.

http://www.safesolutionsinc.com/de/hazard.htm

..............
>From Mary Hooper in an exchange with Darel Henman
What's the difference between one kind of diatomaceous earth and another?

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