Take control of those pesky ants inside and out with Terro's Ant Dust. This waterproof powder kills on contact and lasts up to 8 months. Killing fire ants, carpenter ants, cockroaches, spiders and much more makes this a staple for any household. To help prevent and control invasions, apply Terro Ant Dust thoroughly and uniformly to foundations and crawl spaces where pests are active and may find entrance to your home. The dust acts as a barrier that the ants and other insects must crawl through, ensuring contact and therefore killing them. | Terro Ant Dust | Size 16 oz