http://npic.orst.edu/factsheets/degen.html http://npic.orst.edu/factsheets/degen.html Diatomaceous Earth is a dusty substance made from the shells of tiny sea

http://npic.orst.edu/factsheets/degen.html http://npic.orst.edu/factsheets/degen.html Diatomaceous Earth is a dusty substance made from the shells of tiny sea creatures. The shells are so tiny (and then ground finer) they wedge into the exoskeletons of insects and eventually kill the bbugs. But it's pretty safe for larger animals and safe for home use