This Fly bait is the best Fly Bait on the market. It works almost immediately. It contains both a feed attractant and a sex attractant. It can be used around dumpsters, outside around restaurants, and outside houses where children and pets cannot eat the bait. If you have children and pets in the immediate area, I recommend our Fly Trap (disposable). A little bit goes a long way. Contains Tricosene .04% and Methomyl 1%. Available in one and five lb. sizes.