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Nature's Wisdom DE contains Perma-Guard DE. PERMA-GUARD is the trade name known world wide for using a grade and quality of Diatomaceous Earth (DE) that is extremely pure. Perma-Guard Food Grade Diatomaceous Earth is totally organic and safe. It contains less than 1% percent of Crystal & Silicon. Some people use Diatomaceous Earth on household pets, gardens, flower beds, field crops, grain storage, and livestock feeding. Diatomaceous Earth is Mother Nature's product with no harm to the environment, pets or to people. Diatomaceous Earth is not an earth, it is the fossilized remains of microscopic shells created by one celled plants called DIATOMS. Diatomaceous Earth kills by physical action, not chemical, by puncturing the insect's exoskeleton and absorbing its body fluids, thus posing no harm to warm-blooded life. Moreover, on any surface, this natural product has a remarkable repellency factor. As long as it is present, insects tend to stay away, making a serious infestation unlikely. Also, the more it is used, the more an environment is created that tends to make insects feel unwelcome.