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Pure DE is food-grade diatomaceous earth milled from a freshwater deposit in Oregon, sold in a 20 lb paper bag. It is an amorphous-silica powder with a high surface area, used as a mechanical insecticide in cracks, around foundations and in stored grain, and as a feed additive for livestock. It kills crawling insects by drying them out rather than with a chemical, so it works slowly and needs to stay dry. Against chemical sprays it is cheap per pound and low-risk around food and animals, but it is messy, dusty and useless once wet.
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Out of stockSold by Tractor Supply Co US
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Lowest price we've seen: $27.99 on Nov 9 at Tractor Supply Co. Tracked across 4 stores since Nov 9.
Owners of food-grade diatomaceous earth like this type generally report it works on ants, roaches and grain pests when applied thinly and kept dry, and value the large bag for the money. Complaints center on dust and on how much reapplying outdoor use requires.
