Safer Brand Diatomaceous Earth (D.E.) provides pest control against a variety of crawling insects. This ready-to-use powder-like insecticide is super easy to use and can be applied to places where insects spend most of their time. Once insects come in contact with this powder, it immediately goes to work to completely kill them within 48 hrs. Safer Brand D.E. is non-staining and has no odor, so you can confidently apply it in your home. D.E. also works outdoors to eliminate crawling insects as they try to sneak inside your home. Just keep in mind that it will need to be reapplied after watering or rain.