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Abstract

Apparatus and method for controlling the resistivity of water. The apparatus includes a diffuser injector for mixing water and a water soluble gas such as carbon dioxide gas and that defines an inlet conduit through which water to be treated is communicated and an output conduit from which treated water is discharged. A diffuser tube is disposed within one of the conduits for injecting carbon dioxide gas into the water. A proportional control valve provides carbon dioxide gas from a carbon dioxide tank to the carbon dioxide diffuser tube. Downstream from the diffuser injector are a static mixer for further intermingling the water and carbon dioxide gas and a serially connected contact chamber for enhancing the stability in the resistivity level of the water. A resistivity monitor measures the resistivity of the water and carbon dioxide mixture and transmits a signal to a controller. The controller receives and converts the signals transmitted by the resistivity monitor and sends a corrective signal to the proportional control valve to proportionately adjust the injection rate of carbon dioxide gas into the diffuser injector.

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First Claim