Harris Diatomaceous Earth Crawling Insect Killer 9 oz. kills cockroaches fleas ants bed bugs silverfish and more with diatomaceous earth. This ready-to-use powder insecticide works indoors and outdoors to guard against nuisance pests. Bed bugs ants roaches fleas and silverfish that come in contact or ingest this powder die within 48-hours. Unlike liquid or spray products insects can’t become immune to diatomaceous earth. Using the puffer-style 9-ounce bottle as an applicator apply powder in cracks and crevices and other areas where insects are found. Not intended for human consumption. Always follow label instructions and keep out of reach of children.