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. The 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. Made from used 2-liter soft drink bottles, the Rescue. POP. Fly Trap is reusable and recyclable. Once the RESCUE!Â® POP! Fly Trap has fulfilled its desired use and reuse, the plastic components can and should be recycled. For outdoor use only.