Water-deionizing system

Abstract From the Canadian patent

A system for producing deionized water comprising at least a pair of oppositely charged ion exchanger units connected in series, a pump a sensor for, detecting the level of specific conductivity of process water and lines connecting the pump, ion exchanger unit and sensor in a closed-loop flow circuit. A controller operates the system in a first mode in which a batch of process water is repeatedly circulated along the closed-loop flow circuit until the specific conductivity sensed is less than a first predetermined level and alternately in a second mode in which the batch of water so treated is discharged while another batch of water is introduced into the system until the specific …