How Do I Fix Green Pool Water Quickly?

Shock the pool, balance the chemicals, and run the filter continuously. For lasting protection, consider using our AquaDoc Pool Algaecide.

Why Is My Pool Water Green?

Green water is usually caused by:

• Low chlorine levels: Without enough sanitizer, algae multiply fast.
  

• Imbalanced water chemistry: High pH and alkalinity levels can reduce chlorine effectiveness.
  

• Poor circulation and filtration: Stagnant water encourages algae growth.
  

• Heavy rain or debris: Organic contaminants from storms or leaves can deplete chlorine.
  

Once algae start growing, they spread quickly. Acting fast will save time and effort in restoring your pool.

Step-by-Step Guide to Clearing Green Pool Water

1. Test and Balance the Water

The first step is to test your pool’s water using a reliable test kit or test strips. Check for:

• Chlorine levels (should be at least 3 ppm for shocking)
  

• pH levels (should be between 7.2 and 7.4 for effective shock treatment)
  

• Alkalinity (should be 80-120 ppm)
  

If pH is too high, add pH reducer to bring it within range. This helps chlorine work more effectively.

2. Shock the Pool

Pool shocking involves adding a high dose of chlorine to kill algae. Follow these steps:

• Use calcium hypochlorite shock for best results.
  

• Add 3 to 4 times the normal shock dose for mild to moderate algae growth.
  

• For severe algae, use double or triple shock treatment (4-6 pounds per 10,000 gallons of water).
  

• Pour shock directly into the pool, spreading it around the perimeter.
  

• Run the pump for at least 24 hours to circulate the chlorine.
  

3. Brush the Pool Thoroughly

After shocking, brush the pool walls, floor, and steps to loosen algae. Focus on areas with visible buildup, such as corners and steps.

• Use a stiff pool brush for concrete pools.
  

• Use a soft-bristle brush for vinyl liners to prevent damage.
  

Brushing helps chlorine penetrate algae more effectively.

4. Run the Pool Filter Continuously

Your filter is essential for removing dead algae and clearing cloudy water. Run the filter non-stop for at least 24-48 hours.

• Sand Filters: Backwash frequently to prevent clogging.
  

• Cartridge Filters: Clean or replace the cartridge as needed.
  

• DE Filters: Backwash and add fresh DE powder to maintain efficiency.
  

5. Add an Algaecide (Optional)

Algaecides can help speed up the process and prevent future growth.

• Use polyquat 60 algaecide for a non-foaming solution.
  

• Avoid copper-based algaecides if you have metal staining issues.
  

Add the recommended dose based on your pool size and let it circulate.

6. Vacuum the Pool

Once algae start dying, they will settle at the bottom. Vacuuming removes debris and prevents it from re-entering the water.

• Use a manual vacuum for best results.
  

• Set the filter to waste mode if using a sand or DE filter to avoid recirculating algae.
  

7. Re-Test and Adjust Chemicals

After shocking and filtering, test the water again. Adjust the following:

• Chlorine: Maintain 1-3 ppm for daily levels.
  

• pH: Keep between 7.4-7.6.
  

• Alkalinity: Maintain 80-120 ppm.
  

• Cyanuric Acid (CYA): If too low, chlorine will burn off quickly.
  

8. Maintain Proper Pool Care

To prevent green water in the future:

• Test water regularly: Check chlorine and pH levels at least twice a week.
  

• Run the filter daily: Ensure proper circulation for at least 8-12 hours.
  

• Shock the pool weekly: Prevent algae from taking hold.
  

• Remove debris promptly: Leaves and dirt can deplete chlorine.
  

• Keep pool chemicals balanced: Proper chemistry prevents algae growth.
  

By following these steps, you can clear green water fast and keep your pool sparkling clean all season.