Durvet - For use in swine, poultry, beef and dairy cattle. Contains 12% aspirin. A concentrated solution for use in drinking water. Add 1 oz to 1 gallon water. Stir stock solution and meter with proportioner at a rate of 1:128 ratio. For seven-day continuous rate, use 4 oz. of product to 1 gallon of water on day one and 1 oz. of product to 1 gallon of water for the remaining 6 days. No withdrawal.