RESCUE! Non-Toxic Reusable Fly Trap Attractant Refill Attractant Refill for FTR Fly Trap; attracts hundreds of species of common nuisance or filth flies Attracts house flies, false stable flies, blow flies, blue and green bottle flies, flesh flies, face flies and many others Each refill packet contains one application that generally lasts two weeks to a month Dissolves and activates in water Made in USA; no poisons or killing agents used