✅ THE STRONGEST CLUSTER FLY POWDER ON THE MARKET – Containing maximum strength Permethrin, this highly effective cluster fly powder kills all stages of the cluster fly lifecycle. ✅ FAST ACTING – Formula P is a fasting acting cluster fly powder that kills the cluster fly life cycle on contact. ✅ PERFECT FOR USE IN THE HOME - This highly effective cluster fly powder can be applied to any surface indoors or externally to eradicate cluster fly infestations. ✅ EASY-TO-USE – Supplied in an easy-to-use puffer pack, Formula P is ideal to use around power points and other hard to reach areas. ✅ INCREASED COVERAGE – Pest Expert Formula P Powder contains 300g of maximum strength powder, which is twice the size of many competitors, making it the most cost-effective cluster fly powder on the market.