You know, I'm a little suspicious about the dire warnings about using pool grade DE versus food grade, but I'm not going to test my doubts by using pool grade. All the warnings I've heard come from food grade DE sellers. I've got a pool and pool grade DE looks and feels identical to food grade, and it is much cheaper. I haven't looked for any independent expert opinions on this issue so I'll just continue using only food grade DE on plants.
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