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Lumino Organic Diatomaceous Earth For Pets 1.5 lb Alternative to toxic chemicals Keep dogs and cats happy and healthy. Protect pets from fleas. Diatomaceous earth is an environmentally friendly alternative to toxic commercial flea and tick treatments. Diatomaceous earth is a fine powder composed of the crushed fossilized exoskeletons of microscopic diatoms. This is a remarkable substance that is a desiccant--it actually dries out the waxy outer layer of fleas, causing them death by dehydration. In tests performed by the USDA, as well as a number of consumer trials, diatomaceous earth has proven to be an effective non-chemical insect control