Diatomaceous Earth (DE) is a substance made up of the fossilzed remains of plankton; it looks like an off-white talc powder. It can kill any bug with an exoskeleton easily, but is safe for any mammal to eat. It is a popular way to kill bugs without using insecticide.

Diatomaceous Earth is almost pure silica (with some beneficial trace minerals); under a microscope, it looks like shards of glass (glass is made from silica). On any beetle-type insect that has a carapace, like fleas and cockroaches, the DE works under the shell and punctures the body, which then dehydrates and the insect dies. DE is totally nontoxic. There is no buildup of tolerance like there is to poisons because the method of killing is PHYSICAL, not chemical.

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