The Sterling BFTD-DB12 Big Bag Fly Trap is an ideal solution for stables and barns to keep flies away from farm animals. You can also place this item near kennels, pet areas, compost piles and patios to reduce flies. This product will repel a wide range of species, from common house flies to face flies and more. Simply add water and hang it up. The Rescue fly trap does not contain any pesticides and holds up to 40,000 flies.