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The model 656 Pure Light™ is a go/no-go water quality indicator, ideal for purification systems including service deionization (DI) and reverse osmosis (RO). Five user-selectable selectable ranges allow the user to set water purity level from 20 to 0.5 µS/cm conductivity, or 50 kΏ-cm to 2 MΏ-cm resistivity. A built-in timer is selectable for 90 or 180 days elapsed since last servicing. The timing feature helps avoid the risk of organic or biofouling the ion exchange resin. The timer is easily reset with a pushbutton, and elapsed time and water purity ranges are selected by choosing a jumper position.
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