Attracts 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. Unique features and benefits: non-toxic, dissolves and activates in water, no killing agents – insects drown.