Nettex Equine Advanced Fly Repellent is a powerful and long-lasting fly spray that easily deters flies and biting insects. This effective fly repellent has added moisturisers, conditioners and natural extracts that assist the longevity of the DEET-based formulation. A great fly repellent for horses and ponies kept in problem areas such as around ponds, streams and waterways that are heavily burdened with biting insects. Make sure you don't run out with our EQUUS Refill Subscription Service. Size Guide Available in sizes - 250ml, 500ml, or 2 Litres.