Barium sulfate volume and method of administration are determined by individual technique, and may vary with differing patient and procedure characteristics. Add water to the desired % w/w fill line on bottle. Replace lid. Invert bottle, tap bottom to loosen barium, and shake vigorously for 30 seconds. Let stand at least 5 minutes. Add additional water as necessary to achieve the desired % mixture. Replace lid, and again shake vigorously for 30 seconds.