Diatomaceous Earth Ant & Crawling Insect Killer is effective against a variety of crawling insects including ants, fleas, bedbugs, cockroaches, silverfish, earwigs, and more. Takes care of pest problems without the use of harsh chemical sprays. The formula is non-staining and has no odor, so you can confidently apply it in and around your home. Diatomaceous earth is made up of finely crushed algae fossils. Though it feels soft to the touch for us, each microscopic piece is like a tiny shard of glass to small insects. It damages insects exoskeletons as they move across it or ingest it. Insects become dehydrated and die within 48 hours after contact. Keep in mind that large infestations can take a few days for insects to make contact. Apply where you suspect or anticipate insect activity, spread it as a barrier to entry points in your home, or apply directly on insects. This product is suitable for application both indoors and outdoors. It is also OMRI Listed and compliant for use in organic gardening.