The active ingredient in this special roach control product is Gentrol insect growth regulator (IGR), Hydroprene 90.60%, a biorational insecticide similar to insect growth hormones that occur naturally in roaches. Gentrol is unique in that it controls roach populations by inhibiting reproduction. One to two weeks after application, you will begin to see roaches with crinkled wings, showing the initial effects of Gentrol. These roaches cannot reproduce. Because immature roaches are prevented from developing into reproductive adults, this product effectively breaks the roach life cycle. By inhibiting reproduction, Gentrol Point Source, by itself, will control cockroach populations over time. For faster results, use Maxforce Roach Gel or Acephate. Once Gentrol is released, the active ingredient (Hydroprene) moves from the Gentrol Point Source device into a localized area. Roaches do not have to come into contact with the Gentrol Point Source to be affected! Gentrol is labeled for restaurants, homes, kitchens, nursing homes, hospitals, and lots of other places. Gentrol can be purchased as Gentrol Point Sources, Gentrol Aerosol, or in 1 oz. vials which make 1 gal. each.