I read the entire article on richsoil.com on DE, and looked this forum over pretty well. What I've discovered is that DE isn't all the same, even if classified as "food grade", but I haven't found what the size of the **average** DE pieces are.
Mites can be extremely small, and I am curious if the DE fragments are just too large to present a problem to them. The scabies mite, nasty parasites that they are, can be as small as 0.15 mm (150 microns). Some of the DE sizes mentioned in the end of the richsoil article can be almost twice that size and thus probably not lethal to scabies mites. If anyone is knowledgeable about DE and how to obtain it with fragment sizes small enough to kill mites the size of male scabies mites (Sarcoptes scabiei) I would love to hear from you, or anyone else that can tell me about DE products / brands and their fragment size ranges.