Series PWW offers two isolated water circuits: one on the supply side and one on the process side. The demand side includes a coolant reservoir and a circulating pump. The process side includes an electronically actuated ball valve for modulating coolant flow rate in order to maintain the desired process and equipment temperature. The water-to-water heat exchangers provide liquid cooling, an efficient method for removing heat from many types of industrial processes. Options include supply-side filters for dirty water and high pressure pumps for long process-side pipe runs. Typical applications include water-cooled variable-frequency drives, chemical reaction vessels and chambers, and lasers.