Dosage without the use of electricity. Dosates only by water pressure and flow and doses 100% proportionally to water pressure and flow. Constant and accurate dosage of all types of liquid additives. Many years of experience with dosage in many industries and applications. Water flow: 500 to 8,000 liters per. hour. Dosage between 0.2 - 2%. Pressure: 0.15 - 8 bar. Integrated ByPass system.