Living in Scottsdale or the East Valley means you get to enjoy sunshine almost year-round—but that same sun can turn your pool green if you’re not careful. If your water is cloudy, slimy, or tinted green, algae has likely taken hold. The good news? You can fix it fast with the right products and a few easy steps.
At Marlin Pools, we’ve helped thousands of local homeowners keep their pools clean and swim-ready. In this guide, we’ll explain why pools turn green, what chemicals are essential for treatment, and how to stop algae from coming back.
Why Do Pools Turn Green?
When your pool water starts looking more like a swamp than a place to relax, it usually means algae is blooming. That algae thrives when:
- Chlorine levels are too low
- The pH or alkalinity is unbalanced
- Filtration or circulation is poor
- Debris (like leaves or dirt) sits too long
- Warm weather and sunlight speed up algae growth
In East Valley climates, where temperatures soar and pools get daily sun exposure, it’s especially important to keep your chemical levels stable and filters running properly.
What Chemicals Do You Need to Clear Green Pool Water?
Don’t guess when it comes to chemicals—start by testing your water. You need to know:
- Free chlorine levels
- pH and total alkalinity
- Cyanuric acid (stabilizer) content
Step-by-Step: Clearing Green Pool Water
1. Balance pH and Alkalinity
Before you shock the water, make sure your pH is between 7.4 and 7.6, and your alkalinity is between 80–120 ppm. Adjust with pH increaser or reducer and alkalinity products as needed.
2. Shock the Pool
Use a chlorine-based shock treatment to kill algae and sanitize the water. How much depends on how green your pool is:
- Light green: 1 lb of shock per 10,000 gallons
- Dark green/cloudy: 2–3 lbs per 10,000 gallons
3. Add Algaecide
Follow up with an effective algaecide to kill any lingering spores. This step helps prevent new blooms from forming.
4. Run the Pump and Brush the Pool
Let your pump run 24–48 hours straight after treatment. During this time, brush the walls and floor of your pool thoroughly to remove any remaining algae buildup.
5. Use a Clarifier (If Needed)
If your water is still cloudy after shocking, a clarifier can help group tiny particles together so your filter can trap them more effectively.
Tips to Prevent Algae Growth in the Future
- Test your water weekly (or bring it to us for free)
- Keep chlorine levels steady with tablets or a chlorinator
- Clean filters regularly and ensure good circulation
- Skim and brush your pool 2–3 times per week
- Shock after heavy use or storms
Serving Scottsdale & the East Valley with Expert Pool Support
If you’re dealing with green pool water or just want help keeping your pool perfectly balanced, our team is here for you. At Marlin Pools, we’re proud to serve Scottsdale and beyond.
- ✅ Free professional water testing in-store
- ✅ Free service calls—yes, really
- ✅ Trusted advice from experienced technicians
Get a free estimate online today or give us call at 480-404-555
Final Thoughts About Avoiding a Green Pool
Green pool water may be common in the East Valley, but it doesn’t have to ruin your swim season. With a solid routine, the right chemicals, and a little help from our team here at Marlin Pools, you can enjoy a crystal-clear pool all year long.