The Chem-Tech Series 100 is the standard by which all other dosing pumps are judged, Chem-Tech Series 100/150 pumps with motorized-diaphragm technology deliver dependable performance and extended longevity. The Series 100/150 provides quiet, consistent metering over long periods of time in a compact form. Series 100 Models – The preferred metering pump for water conditioning professionals around the world. Perfect for applications where economical, consistent performance is required. Capable of a wide range of flows, from less than 3 gpd (0.47 lph) up to 30 gpd (4.72 lph) and pressures up to 100 psi (7 bar). Series 150 Models – Built upon the same solid platform as the 100 Models, these units are capable of higher flow rates.