Dosing and metering pumps, which belong to the positive displacement category, are designed to inject a chemical or another substance into a flow of water, gas or steam. Dosing and metering pumps, which are typically small, provide an extremely precise flow rate for maximum control. They are the central part of an integrated dosing system designed for automatic dispersion of chemicals. This dosing definition applies to a wide range of applications and industries, from wastewater treatment to food processing.