Published November 1, 2026 · By the Phoenix Pool Pros team

Green pool fixes in Arizona heat

Warm water, intense sun and dust storms make it easy for algae to take hold in Valley pools, especially when chlorine runs low during summer.

Why pools turn green

• Low free chlorine: sunlight breaks down chlorine quickly.
• pH out of range: high pH makes chlorine less effective.
• Poor circulation or a dirty filter.
• Debris after monsoon storms adds nutrients for algae.

Basic steps

1. Test the water for free chlorine and pH. The CDC's healthy swimming guidance covers recommended chlorine and pH levels.
2. Brush and skim walls and floor to loosen algae.
3. Balance pH first, then shock, following the product label exactly.
4. Run the pump continuously and clean or backwash the filter.
5. Retest before anyone swims.

Safety first

Never mix pool chemicals together, and store them as the label directs. See the CDC's healthy swimming resources.

When to call a pro

If the water stays green after a few days, or you suspect an equipment problem, a licensed pool service and repair contractor can diagnose it. Find one near you.

General information only; follow product labels and local guidance.

Find a licensed pool contractor near you

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