Pool Water Chemistry: What Every Arizona Homeowner Should Know

The Four Numbers That Matter

You don't need a chemistry degree to maintain a healthy pool — but you do need to understand four core parameters. Get these right and your water will be clear, comfortable, and safe. Let any one slip and problems follow.

• •pH: 7.2–7.6 (low pH is corrosive; high pH reduces chlorine effectiveness)
• •Free Chlorine: 1–3 ppm (sanitizes your water and kills pathogens)
• •Total Alkalinity: 80–120 ppm (stabilizes pH against rapid swings)
• •Cyanuric Acid: 30–50 ppm (protects chlorine from UV degradation)

Why Arizona Is Different

In Scottsdale and Phoenix, UV intensity is so high that an unconditioned pool can lose all its chlorine within hours. Evaporation concentrates calcium and minerals faster than in most states. And dust storms can change your chemistry dramatically in a single evening. We adjust our testing frequency and chemical targets for Arizona conditions — not the national averages on most product labels.

What Happens When Chemistry Goes Wrong

• •Low pH: eye and skin irritation, corrosion of metal equipment, erosion of grout and plaster
• •High pH: cloudy water, chlorine becomes ineffective (even at high levels), scale formation
• •Low chlorine: algae bloom within 24–48 hours in Arizona summer heat
• •Low alkalinity: pH swings wildly with each chemical addition — nearly impossible to balance
• •Low cyanuric acid: chlorine burns off before the next service visit

When to Call a Pro

Most homeowners can test and make minor adjustments with a test kit and pool store chemicals. But some situations call for professional diagnosis: persistent cloudiness despite correct chemistry, scale buildup on tile or equipment, recurring algae despite treatment, or any time you're unsure what's causing the problem. An incorrect treatment can make things significantly worse.

Need Help With Your Pool?

Get a free estimate from Mirage Waterscape — Scottsdale's trusted pool care specialists.