A sparkling blue pool is every pool owner’s dream—but if your water suddenly turns green, it can quickly become a nightmare. Whether it’s a light tint or a full-blown algae invasion, green water is a clear sign that your pool chemistry is out of balance.
At Sun Pools & Spa, we know how frustrating a green pool can be. That’s why we’re here to help you keep your water clean, clear, and ready for a swim—all season long. In this guide, we’ll explain why pool water turns green, what chemicals you need to fix it, and how to prevent it from happening again. Plus, we’ll show you how to get expert help (including free water testing and service calls!).
Why Does Pool Water Turn Green?
A green pool usually means one thing: algae. But algae doesn’t just appear on its own. Several factors can lead to green water:
- Low chlorine levels – The #1 cause of algae growth.
- Poor water circulation – Dead spots allow algae to thrive.
- Unbalanced pH or alkalinity – Reduces the effectiveness of chlorine.
- Warm temperatures and sunlight – Create the perfect algae breeding ground.
- Neglected cleaning schedule – Leaves, debris, and dirt feed algae growth.
What Chemicals Do You Need to Fix a Green Pool?
Treating a green pool depends on how bad the problem is. Here’s a step-by-step breakdown of what chemicals you’ll need to get your pool back on track.
1. Test Your Water First
Before adding anything, test your water to check:
- Chlorine levels
- pH and alkalinity
- Cyanuric acid (stabilizer)
👉 Tip: Bring a water sample to Sun Pools & Spa for FREE water testing. We’ll tell you exactly what your pool needs.
2. Balance pH and Alkalinity
If your pH is too high or low, chlorine won’t work effectively. Aim for:
- pH: 7.4 – 7.6
- Total Alkalinity: 80 – 120 ppm
Use pH increaser or decreaser and alkalinity adjusters as needed.
3. Shock the Pool with Chlorine
Use a pool shock treatment (also known as calcium hypochlorite) to kill algae.
- For light green water: Use 1 pound per 10,000 gallons
- For dark green water: Use 2–3 pounds per 10,000 gallons
4. Add Algaecide
After shocking the pool, apply an algaecide to destroy any remaining spores.
5. Use a Pool Clarifier
Clarifiers help clear up cloudy water after algae has been killed.
How to Prevent a Green Pool in the Future
✅ Stick to a Regular Cleaning Schedule
- Skim and brush pool walls and floors at least 2–3 times a week.
- Vacuum weekly or use an automatic pool cleaner.
✅ Test Water Weekly
Check chlorine, pH, and alkalinity levels every week. Bring a water sample to us for free testing anytime!
✅ Maintain Proper Chlorine Levels
Use chlorine tablets or a saltwater chlorinator to keep levels steady.
✅ Keep Your Filter Clean
Backwash or clean cartridges regularly to ensure good water circulation.
Common Mistakes That Lead to Green Water
Avoid these common slip-ups:
- Skipping water tests – You can’t treat what you don’t measure.
- Not brushing the pool – Algae can cling to walls and go unnoticed.
- Under-shocking the pool – Always dose based on your pool’s volume and algae level.
- Neglecting filtration – If your filter isn’t working efficiently, algae can bounce back.
Need Help with Green Pool Water? We’ve Got You Covered!
If your pool has gone green and you’re not sure what to do next, don’t panic—just call Sun Pools & Spa! We offer:
- ✅ FREE water testing
- ✅ FREE service calls
- ✅ Expert recommendations tailored to your pool
📞 Contact Us Today: 480-912-7176
Final Feedback Dealing With a Green Pool
Dealing with a green pool isn’t fun—but with the right knowledge (and a little help from your local pros), it’s an easy fix. By staying on top of water testing, chemical balance, and routine cleaning, you can keep your pool crystal clear all season long.
Looking for the right chemicals or tools to clean up your pool?
Visit Sun Pools & Spa to shop water treatment products, book your free service call, or get expert advice today!
