How to Treat a Green Pool and Make It Blue Again Using the Chlorine/Shock Method

How to Treat a Green Pool and Make It Blue Again Using the Chlorine/Shock Method

A green pool can be a frustrating sight, but with the right approach, you can transform it back to a sparkling blue oasis. In this article, we'll guide you through the steps to treat a green pool using the chlorine/shock method, without relying on expensive algaecides.

Understanding the Problem: Why Is My Pool Green?

The green color in your pool is primarily caused by algae growth. Algae thrive in pools with low chlorine levels, poor water circulation, and inadequate filtration. To effectively treat a green pool, you'll need to eliminate the algae and restore the water's clarity. You will also need to figure out why the pool got green in the first place and address the root cause.

Step-by-Step Guide to Treating a Green Pool

1. Preparation

Before you begin the shock treatment, it's essential to prepare your pool:

• Brush the Pool Walls and Floor: Use a pool brush to scrub the walls, floor, and steps. This helps to dislodge the algae and make it easier for the chlorine to kill it. 
• Remove Debris: Skim the pool to remove any visible debris and algae. Clean out the skimmer baskets and filter screens to ensure they don't get clogged during the treatment.

2. Test and Balance the Water

• Test the Water: Use test strips or a liquid test kit to check the pH, alkalinity, cyanuric acid (CYA) levels. The pH should be at 7.5, and the alkalinity should be at 90ppm. Additionally, CYA should bet between 30-50ppm and borate at 50ppm.
• Adjust the Levels: If necessary, adjust the pH, alkalinity, CYA, and borate levels to the recommended levels. This will help the chlorine work more effectively.

3. Shock the Pool

• Choose the Right Shock: Use a chlorine shock that contains at least 70% available chlorine (calcium hypochlorite) or liquid chlorine 12.5% (sodium hypochlorite) for best results.
• Calculate the Amount: For a heavily green pool, you'll need to add 8-10 ppm (parts per million) of chlorine shock per 10,000 gallons of water.
• Add the Shock: It's best to add the shock after sunset to prevent UV light from breaking down the chlorine. Pour the shock into the pool in different spots to ensure even distribution.

4. Run the Filter

• Continuous Filtration: Run your pool filter continuously for at least 24 hours after shocking the pool. This helps to remove the dead algae and clear the water.
• Clean the Filters: Regularly clean the filter traps and screens to prevent them from getting clogged with dead algae.

5. Monitor and Repeat

• Check the Pool: Inspect the pool the next morning. If the water is still green, repeat the shock treatment. Continue running the filter and cleaning the traps until the water turns blue but cloudy.
• Final Steps: Once the pool water is blue and cloudy, keep the filter running until the water clears completely. This indicates that all the algae are dead, and the pool is safe for swimming.

Conclusion

By following these steps, you can effectively treat a green pool using the chlorine/shock method and restore it to its beautiful blue state. Regular maintenance and monitoring of chlorine levels will help prevent future algae blooms and keep your pool crystal clear.