McCauley's Hydrolyte - 25 lb.The unique formulation of McCauleys Hydrolyte encourages drinking and facilitates rehydration. Equine sweat is hypertonic, meaning the level of electrolytes in a horses sweat is greater than the level in its blood. As a result, even if horses are dehydrated, they may lack the desire to drink. When added to drinking water, Hydrolyte provides a more consistent taste and smell to different water sources. This is useful when horses are temporarily