DeltaDust with DeltaGard is the world's first and only 100% waterproof insecticide dust, so it works in the wet and damp places that insects love. Nothing short of running water will disturb it, making DeltaDust an ideal crack and crevice treatment. It's effective against a broad spectrum of insects at a wide range of labeled use sites, indoors and out, especially against fleas and ticks in rodent burrows, as well as around pet kennels and in zoos. Since its effect is not diminished by moisture, DeltaDust provides a residual of up to 8 months with a DeltaGard active ingredient concentration of just 0.05% What's more... DeltaDust is odorless, and is an economical buy --- a standard 1 lb. bottle covers ~2000 sq. ft.