Master hot tub water balance with this guide to pH and alkalinity. Learn what causes imbalances, how to correct them, and why it matters for spa health.

How to Maintain pH and Alkalinity in Your Hot Tub the Right Way

Why Water Balance Matters

Unbalanced water can corrode internal components, reduce heater efficiency, irritate skin, and even void warranties. Keeping your spa’s water chemistry in range is essential for longevity and user comfort.

Target Levels

• pH: 7.2 – 7.8
• Total Alkalinity: 80 – 120 ppm

How to Adjust Alkalinity First

• If too low: Use an alkalinity increaser
• If too high: Add pH reducer gradually and retest

Then Adjust pH

Alkalinity stabilizes pH, so adjust it first. If pH is still too high or low, use pH up/down products and test in small increments every 30–60 minutes.

Best Practices

• Test your water weekly with strips or digital meters
• Keep chemicals in a dry, ventilated space away from kids and pets
• Always adjust with jets running and lid open

Conclusion

Keeping your spa water clean isn’t complicated—but it requires consistency. Mastering pH and alkalinity is one of the easiest ways to protect your investment and enjoy a flawless soak.