Description
FreshWater pH/Alkalinity Up is a fast-dissolving granular product that raises both the pH and total alkalinity of your spa water in a single dose. Active ingredient: sodium carbonate (soda ash). One bottle handles dozens of adjustments for a typical residential spa and works with every sanitizer system — chlorine, bromine, ozone, biguanide, FreshWater Salt, and Hot Spring ACE.
Why this product matters: low pH and low alkalinity are two of the most damaging conditions you can run a spa in. Acidic water (pH below 7.2) corrodes heater elements, eats through seals and gaskets, pits metal jets, and degrades the spa shell over time. Low alkalinity (below 80 ppm) means your pH has no buffer — it swings wildly with every chemical you add, every shock, every fresh body in the water. Most “constantly chasing pH” frustration is actually an alkalinity problem in disguise.
The proper target ranges, recommended by Watkins Wellness:
- Total Alkalinity: 80–120 ppm
- pH: 7.2–7.8
Adjust alkalinity first, then pH. That sequence is the difference between a balanced spa and a spa you spend every weekend tweaking.
Pro Tip: Sodium carbonate (soda ash) raises both pH and alkalinity together — but it raises pH more aggressively per gram than alkalinity. If your pH is already in range but your alkalinity is low, dose conservatively, retest, and add more in small increments. Overshooting pH is the most common mistake with this product.
Brand
FreshWater®
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