Harris Diatomaceous Earth Crawling Insect Killer uses diatomaceous earth to kill roaches, fleas, ants, bed bugs, and more. Harris Diatomaceous Earth Food Grade is OMRI listed with the Organic Materials Review Institute and meets organic use standards. Harris Diatomaceous Earth Food Grade (DE) is composed of 100% ground freshwater DE, with no additives. Insects that come in contact or ingest this powder die within 48-hours. Just apply the powder in cracks and crevices and other areas where insects are found. Harris Diatomaceous Earth Food Grade is chemical free and completely safe to use around children and pets.