Rescue - POP! Fly Trap. What it catches: The RESCUE! POP! Fly Trap catches common nuisance or filth flies around the home and in agricultural settings. This 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. How it works: 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 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. Unique features and benefits: Includes fast-acting attractant, Ready to use - just add water, No killing agents - insects die naturally, Simple and economical to reuse, Gives used 2-liter soft drink bottles a new purpose, Reusable and recyclable, Attractant refills available. What kills the insects?: Once lured inside, the flies cannot escape and drown in the water inside the trap.