EQUITROL II FEED-THRU FLY CONTROL 3.75LB by FARNAM options 3.75 LB - $21.75 3.75 LB Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Please call the store at (434) 392-4192 to place your order. Place Equitrol II Feed-Thru Fly Control pellets in your horses' feed to prevent the development of stable and house flies in the manure of treated horses. Comes in a convenient 10 lb tub and can be applied with an easy application.