Operation - In small, single washer systems with temperatures at or under 140 degrees F., straight DI recirculation system with a scavenger columns is used with high temperature resins. Pressures are kept in the correct range for piping at those temperatures. In larger flow or higher temperature systems, the water returning from the washer is passed through a high temperature filter and a parallel plate heat exchanger sized to provide 110 degree F. exit temperature at the design flow rate then collected in a holding tank. Then the water from the heat exchanger is pumped through a scavenging column which removes any disolved lead or copper, or other heavy metals in the system. The next step is complete deionization through simplex or duplex columns.
Regeneration is automatic and based on conductivity readings.
Upon leaving the DI system the water is passed through the cold side of the heat exchanger to raise the temperature close to the operational set point.