Made for a wide range of water treatment applications are CHEM-TECH Series 100 and 150 positive displacement mechanically actuated diaphragm metering pumps. Offered by Pulsafeeder, they come in many different models, with feed rates from 3 gpd to 100 gpd at operating pressures up to 100 psi. These pumps have a flame-retardant housing, a four ball valve design and a self-maintaining gear train. They are lifetime lubricated, sealed and chemical resistant. Pulsafeeder also makes Series 100D and 150D with dual head assemblies, created for metering two solutions at different outputs. Pulsafeeder, Card No. 323