The Interhatch Redtop fly trap is an effective way to trap up to 20,000 flies at one time. Simply pour in the bait, add 1 liter of water, hang the trap outside about 10 meters from the area you want to protect and watch the flies become attracted to the trap. The Redtop attracts flies from indoors as well as outdoors. It is economical as it doesn’t require any electricity, is environmentally friendly as it is fully disposable, food safe and doesn’t attract bees. Female flies in particular are attracted to the bait, helping to break the reproductive cycle.