In my experience, DE is pretty useless if you find mites or lice on your birds, and completely useless as a wormer.
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That is the great thing about opinions...they are ours and we are entitled to them. I use DE in my daily business and I would not waste the money if it did not work. You will not see rapid results like you may with synthetic inhibitors or poisons, but the great thing is, is that it is completely non toxic and lasts forever as long as it doesn't get soaked. Poisons & synthetics break down fairly quickly and there is evidence, especially in the southern states, that mites are building a tolerence to the pyrithroids at a rapid rate.