Test and Balance Spa Water Chemistry

Use a 5-way test strip to measure pH (target 7.4–7.6), total alkalinity (80–120 ppm), sanitizer (3–5 ppm chlorine or 30–50 ppm bromine), calcium hardness (150–250 ppm), and cyanuric acid if applicable. Adjust one parameter at a time with a 4-hour wait between additions. Low pH corrodes jets, heaters, and skin; high pH causes scale buildup and cloudy water. Unbalanced water destroys pump seals ($150–$400), heater elements ($200–$600), and shell finish. Consistent monthly testing is the single most cost-effective thing you can do to extend spa life.