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.