Made from finely ground fossils of prehistoric fresh water diatoms. Kills pests like roaches, ants, fleas, beetles and most crawling insects. Not a poison, it`s a contact killer and continues to be effective forever, as long as it is dry. Bugs walk through it, it gets on their bodies, kills them. Safe to pets and humans, deadly on bugs. Great in the house to rid you of ants, etc. Directions included. May be applied by sprinkling it or use a plastic squeeze bottle to get into cracks, etc. Cover bottom of nest bowl. Many fanciers sprinkle it on their feed as a 100% safe wormer. Diatomaceous Earth 50 lbs.