If you’ve ever wondered whether baking soda belongs in your hot tub, the answer is yes—when used correctly. Baking soda is a common and safe way to maintain water balance and ensure your spa stays clear and comfortable.
How Baking Soda Helps
Baking soda is primarily used to raise total alkalinity, which stabilizes pH. When alkalinity is in the proper range:
pH swings are minimized
Sanitizer works more effectively
Water stays clear and balanced
Tip: Stable alkalinity makes it much easier to maintain overall water quality.
How to Use Baking Soda Safely
Even though baking soda is gentle, it should be added gradually:
Start with about 1 tablespoon per 100 gallons of water
Add it slowly while the jets are running to circulate
Wait 15–30 minutes and retest before adding more
Adding too much at once can raise alkalinity excessively, causing cloudy water or scale buildup.
What Baking Soda Can’t Do
Baking soda is not a substitute for pH adjustments. If your pH is low, you’ll need a dedicated pH increaser, like sodium carbonate, to correct it. Baking soda’s main role is to support alkalinity, which indirectly helps pH stability.
