The RESCUE!® POP! Fly Trap 1 pack this trap catches common nuisance or filth flies around the home and in agricultural settings. The RESCUE!® POP! Fly Trap is formulated to lure hundreds of the most prevalent fly species including house flies false stable flies blow flies blue and green bottle flies flesh flies face flies and many others. The RESCUE!® POP! Fly Trap comes with one packet of water-soluble attractant packaged inside a foil pouch. Just empty the contents of the foil pouch into the trap and add water. Lured by the scent flies enter through the yellow top cap and drown in the water. Refill attractants for the POP! Fly Trap are sold in single use pouches allowing the trap to be reused over and over. Once the RESCUE!® POP! Fly Trap has fulfilled its desired use and reuse the plastic components can and should be recycled. Once lured inside the RESCUE!® POP! Fly Trap the flies cannot escape and drown in the water inside the trap.