Rein Water™ is an all natural powder drink additive that encourages horses to drink more while providing them with natural electrolytes. The natural ingredients come from Redmond’s mineral deposits in Central Utah and are brought to you in their natural, unrefined state, full of beneficial minerals. And, like every Redmond Equine product, you know your horses will get essential trace minerals and electrolytes in a natural blend only nature could have made. 5 lbs.