The ORP stands for Oxidation Reduction Potential and is how Arctic Spas is able to detect the Chlorine and pH levels with a SpaBoy probe. By measuring this, the computer can turn on and off the Salt Cell automatically saving people headaches when balancing a hot tub or swim spa. John Keirstead show users who own a Custom Series or upgraded Classic to Custom spa with SpaBoy how to read the ORP and pH on the control panel. You can also do it online. However, it would be beneficial to know how to do this manually on the top side.

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