Duplex water softeners give a 24 hour supply of softened water. Duplex systems use two resin vessels, one in service, the second on standby. The water flow to service is metered and when the service column is exhausted, the control valve automatically switches, allowing the second unit to go online. The exhausted resin in the first column is fully regenerated and remains on standby until the second column is exhausted, then the control valve switches back to the first column again. A duplex water softener can be sized to allow up to 4 regenerations in any one 24 hour period. Parallel systems with both vessels on line at the same time are also available. A duplex water softening system is better suited for applications where a 24 hour constant supply of softened water is required or where times of water flow are varied. Using two smaller resin vessels as opposed to a large single simplex system can reduce the height of your softening system dramatically.
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