Mastering the Arctic Spas Onzen Saltwater System requires understanding that it is not completely hands-off. It is an automated maintenance ecosystem that relies on precise chemistry to function.
Instead of adding harsh chemical compounds manually every day, the Onzen system utilizes natural Dead Sea salts and a sacrificial titanium electrode (salt cell) to generate pure chlorine through electrolysis.
To achieve and maintain crystal clear water, follow this master guide to configuration, chemistry, and maintenance. 1. The Startup Routine (Crucial First Steps)
Never add salt to cold, unbalanced water. This will ruin your initial chemistry profile and can damage your components.
Heat the water first: Fill your tub and allow the water temperature to reach at least 85°F (29°C) before adding any chemicals.
Prevent Scale: Add an initial dose of a scale inhibitor like Best Defence (2 oz per 1,000 L) to hold minerals in suspension.
Balance Alkalinity & pH: Use test strips to adjust Total Alkalinity (TA) first, aiming for 80–100 ppm. Then, adjust your pH to the lower end of the scale (7.2–7.4). Note: Saltwater systems naturally push pH levels upward, so starting low gives you a safety buffer.
Add Salt in 3 Stages: Refer to the Arctic Spas Salt Dose Table for your exact hot tub model. Dissolve only ⁄3 of the total salt dose in a bucket of warm water at a time. Pour it into the spa with the pumps running. Wait 30 minutes, re-test and re-adjust the rising pH back down, then add the next third. Target an overall salinity of 2,200 ppm. 2. Tailoring the Onzen Output (System Settings)
Your water will turn cloudy if the system is under-producing chlorine, or it will become corrosive if it is over-producing. You must match the system’s runtime to your physical bather load. Arctic Spas Onzen Salt Water Instructions Oct 4, 2017 YouTube·Arctic Spas Utah Onzen Saltwater Instructions | Arctic Spas Tutorial Video
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