Making pest control smarter. Common nuisance or filth flies including house flies, cluster flies, false stable flies, blow flies, bottle flies, flesh flies and others. The Rescue! Fly Attractant works inside the Rescue! Reusable Fly Trap to lure common nuisance or filth flies. Each refill packet contains one application that generally lasts two weeks to a month. Just drop the water-soluble pouch into the trap jar, add water to the fill line, replace the top, and hang or place the trap outside near a fly source. Non-toxic mode of action Dissolves and activates in water No killing agents insects drown To be reused again & again. What kills the insects?: The flies drown inside the trap. Where it’s used Use the Rescue! Fly Trap outdoors near household garbage bins, compost piles, dog kennels and other pet areas. When it’s used The Rescue! Reusable Fly Trap can be used whenever hot, humid conditions or the presence of animals or garbage causes an outdoor fly problem.