Spa pH regulators

• Comfort: Correct pH = less itchy eyes and dry skin.
  
• Disinfectant effectiveness: pH too high → chlorine less effective; pH too low → corrosive water.
  
• Equipment: Poorly adjusted pH can corrode metals, seals and heating elements or, conversely, promote limescale deposits.

First, stabilize total alkalinity at 100–150 ppm. Proper alkalinity buffers pH and limits roller coasters. Then, fine-tune pH.

• Adjustment procedure: With the pump running, add small doses (pH+ to increase, pH− to decrease). Ensure the alkalinity is 100–150 ppm to stabilize the pH.
  
• If pH too low (<7.2): eye/skin irritation, “aggressive” water, risk of corrosion, strong odor. → Add pH+ in small steps.
  
• If pH too high (>7.8): cloudy water, limescale deposits, less effective disinfectant, persistent odor. → Add pH− in small steps.

• Use strips or a liquid kit (more accurate).
  
• Frequency: 1×/week, and always after a long swim or adding product.
  
  

• Targets: pH 7.2–7.8 · Total alkalinity 100–150 ppm · Calcium hardness 100–200 ppm
  
• Order: Alkalinity → pH → Hardness. Adjust only one parameter at a time. Wait 20-30 minutes between each product.

The pH indicates whether the water is acidic or basic on a scale of 0 to 14 (7 = neutral). In a spa, the ideal range is 7.2 to 7.8: it maximizes comfort (less eye/skin irritation), maintains good disinfectant effectiveness (chlorine or bromine), and preserves the equipment. A pH that is too low makes the water corrosive and irritating; a pH that is too high promotes scale, turbidity, and reduces the action of the disinfectant.