Blue-White Industries C-645P Chem-Feed® C-600P Diaphragm Metering Pump for Chemical Feeders; 91 GPD/3.8 gph, Polypropylene, 115V 60Hz combines high quality materials of construction and smart engineering with flexibility and value. Because we manufacture most of the components in our own plant, including the all ball bearing gear motor, we can offer Chem-Feed® metering pumps with a wide range of configuration, material, voltage and feed rate options.