Safer Brand 4 lb. Diatomaceous Earth is an effective and natural way to kill a variety of crawling insects, including bed bugs, fleas, roaches, ants, and earwigs. It contains 100% diatomaceous earth amorphous silica, including silicon dioxide, other oxides, and moisture. This product works by ingestion and/or dehydration within 48 hours and can be used both indoors and outdoors when kept dry. It is not safe for pets.