My local agway sells it for 32 Bucks for a 50LBS Bag Food Grade.
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If you actually read their study, it "worked" on about half the birds of ONE specific breed, but not well enough to reach any real conclusions.There has been scientific studies done on Diatomaceous Earth at the University of Britsh Columbia.
The stuff works.
Effect of diatomaceous earth on parasite load, egg production, and egg quality of free-range organic laying hens.
D.C. Bennet, A.Yee, Y.J. Rhee and K.M. Cheng
Avian Research Centre, Faculty of Land and Food System, University of British Columbia (Canada)
http://www.ncbi.nlm.nih.gov/pubmed/21673156
In it they state, "DE had no effect
on the number of hens infected, FEC, or worm burdens. However, body mass and egg production were greater in hens consuming the DE diets.[/B]
These hens also laid larger eggs with thicker shells. The results of this study suggest that there is
no evidence that DE is an effective treatment to control gastrointestinal parasitic infections of free-range laying hens.