★★★★★
I am reading a book on Diatomaceous Earth by Tui Rose called "Going Green Using Diatomaceous Earth How to Tips." She says that straight food grade DE is not sharp like glass, it actually works to kill pests through dessication, or dehydration. Industrial grade DE is heated and the heating process makes it sharper, like glass. If you are using food grade DE it is not glass and not the sharp edges that are killing the pests.
