Introduce SimpliFly Feed-Thru Fly Control to your horse's daily diet, and suddenly you're turning the favorite breeding grounds of stable and house flies into a No Fly Zone. When fed daily, SimpliFly Feed-Thru Fly Control breaks the house and stable fly life cycle by preventing fly larvae from developing in a horse's manure. This fly growth regulator is made without organophosphates and will pass through your horse's body unabsorbed. REDUCE THE FLY POPULATION around your stable by preventing house and stable flies from developing in your horse's manure. HIGHLY PALATABLE PELLETS made with alfalfa. Simply add to your horse's feed. CONTAINS NO ORGANOPHOSPHATES and passes through your horse without being absorbed. Only affects your horse's manure. FORMULATED WITH LARVASTOP and diflubenzuron as the main active ingredients to prevent the formation of house and stable flies. ECONOMIC SIZING OPTIONS AVAILABLE in 3.75 lb. 60-day supply, 10 lb. 160-day supply, 20 lb. 320-day supply and 50 lb. 800-day supply. A 3.75lb bucket lasts 60 days for one horse!