When insects crawl over the fine powder it scratches their waxy outer protection causing them to dehydrate and die within 48hr. DE will remain active as long as it is kept dry.
Diatomaceous Earth, also known as silicon dioxide, is an odourless non staining powder made of fossilized aquatic microorganisms. It remains effective for the control of the insects for as long as DE is present.
Directions - Lightly coat the infested areas (pet beds, carpet, furniture, baseboards etc) where fleas are found. Vacuum after 4 days and reapply.