Yeah, I was always worried about getting some kind of silicosis. From[1]: > A very small amount of crystalline diatomaceous earth may be found in pesticide pr

Yeah, I was always worried about getting some kind of silicosis. From[1]: > A very small amount of crystalline diatomaceous earth may be found in pesticide products. Long-term inhalation of the crystalline form is associated with silicosis, chronic bronchitis, and other respiratory problems. The bulk of diatomaceous earth is amorphous, not crystalline. The amorphous form is only associated with mild, reversible lung inflammation. [1] http://npic.orst.edu/factsheets/degen.html http://npic.orst.edu/factsheets/degen.html