Get ahead of the fly season with Equitrol II feed-through fly control for horses. Equitrol II prevents the development of house and stable fly larvae in the manure of treated horses. Equitrol II is a feed-through fly repellent for horses that effectively breaks the fly life cycle by preventing house and stable fly larvae from developing into mature adults, resulting in a reduced fly population. Start using Equitrol II, the trusted fly repellent supplement for horses early in the fly season, and continue throughout the summer until cold weather restricts fly activity. A ten-pound bucket lasts 160 days for one horse. Equitrol II should be used as part of an integrated pest management program aimed at reducing fly populations in the horse's environment.