It works on mice rats voles. Diatomaceous earth is a naturally occurring sand extracted from the earth. Diatomaceous Earth Diatomaceous Earth Diatomaceous Earth Food Grade Things To Come This causes the insects to dehydrate and the fleas die. Diatomaceous earth for lawns . Usually referred to as simply DE diatomaceous earth is produced by grinding the fossilized remains of phytoplankton called diatoms into a fine powdery dust. What Is Diatomaceous Earth. You can also use a wet mixture of DE as a cleaner around the house. Also can be used to treat the outside of your house. But what most people dont know is that when you combine DE with these essential oils you create the most potent natural rodent repellent in existence. If pest problems persist reapply it again in one week. A well-known fact among essential oil users is that rodents hate the potent smells of peppermint and lemon citrus essential oils. Diatomaceous earth DE also called diatomite is a chalky lightw...