Sol, Apparently, with exo-skeleton insects it cuts the cartilage which prevents movement and they starve to death. I'm not sure how it would affect earthworms. I guess if they had worms it would cleanse them too. Ha Ha. I have never found 'grading' on any DE. Bill Keen
sol <[email protected]> wrote: I have read several places that pool grade DE should never be used internally for humans or animals. I use pure freshwater DE myself. No additive chemicals, not heat treated. Forget where I got it but it was inexpensive. I got 20 lbs so I could use some in the garden, but was then told it will kill earthworms and bees as well as slugs. sol Bill Keen wrote:
