TERRO Liquid Ant Baits contain borax which is specifically designed to allow worker ants to consume the product and survive long enough to carry the liquid back to the nest. Worker ants pass it around to the rest of the colony. The active ingredient in the bait interferes with the ants’ digestive systems, ultimately killing them. You will initially see more ants as they are attracted to the liquid. As the bait is eaten and shared populations will begin to decline. Complete control may take up to two weeks. For indoor use.