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Why Your Pool Turns Green in Summer and How to Stop It

By Christopher Williams  •   2 minute read

Why Your Pool Turns Green in Summer and How to Stop It

Nothing Ruins Summer Faster Than a Green Pool

You've been keeping up with your pool all season, and then almost overnight the water turns green.

Green pool water is one of the most common problems Arizona pool owners face during July. Fortunately, it's also one of the easiest to prevent when you understand what's happening.

What Causes Green Pool Water?

In most cases, green water is caused by algae.

Algae thrive when:

• Chlorine levels fall too low

• Water circulation is poor

• Filters are dirty

• High temperatures accelerate algae growth

• Heavy monsoon storms introduce contaminants

Arizona's combination of extreme heat and intense sunlight creates ideal conditions for algae if your pool chemistry isn't properly maintained.

Signs Algae Is Starting

Watch for these early warning signs:

• Water beginning to look dull

• Slight green tint

• Slippery pool walls

• Increased chlorine demand

• Small green patches on steps or corners

Addressing algae early saves both time and money.

How to Prevent a Green Pool

Maintain Proper Chlorine Levels

Never let chlorine remain below the recommended range.

During extreme heat, your pool may require additional chlorine to stay protected.

Brush Weekly

Algae often begin growing in areas with poor circulation.

Regular brushing removes algae before it becomes visible.

Keep Your Filter Clean

Your filter captures microscopic contaminants that feed algae.

Cleaning or backwashing on schedule improves water clarity and sanitizer effectiveness.

Shock After Heavy Pool Use

Birthday parties, holiday gatherings, and weekends introduce oils, sunscreen, sweat, and organic contaminants.

A weekly shock treatment helps restore water quality.

Test Water Frequently

Water chemistry can change quickly during July.

Testing several times each week allows you to make small corrections before major issues develop.

What If Your Pool Is Already Green?

If your water has already turned green:

  1. Test your water.
  2. Balance the pH.
  3. Add the appropriate shock treatment.
  4. Brush the entire pool thoroughly.
  5. Run your filtration system continuously until the water clears.
  6. Clean or backwash your filter as needed.

If the problem persists, bring a water sample to Ever-Klear Pool Supply for professional testing and personalized recommendations.

Trust Ever-Klear Pool Supply

Whether you're caring for a backyard pool or managing multiple commercial properties, Ever-Klear Pool Supply has the products and expertise you need.

From liquid chlorine and algaecides to pumps, filters, replacement parts, and expert water testing, we're committed to helping Arizona pool owners enjoy clean, healthy water all summer long.

Visit Ever-Klear Pool Supply today for expert advice, quality pool products, and everything you need to keep your pool sparkling all season.

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