Safer Home Ant & Crawling Insect Killer is a powder made from diatomaceous earth and selected baits to kill roaches, ants, fleas, silverfish, earwigs, bedbugs, and other crawling insects within 48 hours after contact. Safer Home Ant & Crawling Insect Killer takes care of pest problems without harsh chemicals. The 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.