Made from the mineral remains of single-cell aquatic plants, diatomaceous earth is a super-fine dust that kills by abrading and dehydrating crawling insects. It controls slugs, ants, cockroaches, beetles, earwigs, silverfish, fleas, bedbugs, millipedes, centipedes, and other crawling insects without the use of chemicals within 24 to 48 hours of contact. Apply as a dust or a slurry. All-natural and earthworm-safe. Made from the fossilized shells of ancient sea life.