How to Treat a Green Swimming Pool

swimming pool green


A green swimming pool can be a frustrating and unsightly problem. However, with the right knowledge and actions, you can restore your pool’s clarity and cleanliness. In this article, we will discuss the steps to effectively treat a green swimming pool, ensuring it becomes a clear and inviting oasis once again.

  1. Understanding the Causes of Green Pools

Before diving into the treatment process, it’s important to understand why pools turn green. The primary cause is the growth of algae, which can occur due to various factors such as improper water balance, insufficient filtration, lack of sanitizer, or poor pool maintenance. Identifying the cause will help address the underlying issue and prevent future occurrences.

  1. Testing and Balancing Pool Chemistry

The first step in treating a green pool is to test and balance the pool’s chemistry. Use a reliable pool testing kit to measure the water’s pH, chlorine levels, alkalinity, and other important parameters. Adjust the pH levels to the recommended range (between 7.2 and 7.6) and ensure proper chlorine levels are maintained. Balancing the pool chemistry creates an environment that inhibits algae growth and promotes water clarity.

  1. Shocking the Pool

Shocking the pool is a crucial step in treating a green pool. Shocking involves adding a high dose of chlorine or a non-chlorine shock product to eliminate algae and organic contaminants. Follow the manufacturer’s instructions for the specific shock product you’re using and calculate the appropriate dosage based on your pool size. Ensure proper circulation of the water during the shocking process to distribute the chemicals evenly.

  1. Algaecide Treatment

In addition to shocking the pool, using an algaecide is recommended to target and eradicate the algae. Choose an algaecide that is compatible with your pool type and follow the instructions for application. Algaecides work by destroying existing algae and preventing its regrowth, helping to restore the pool’s clarity and prevent future green water issues.

  1. Brushing and Vacuuming

Brushing the pool’s surfaces and vacuuming any debris is essential to remove algae and other organic matter. Use a pool brush to scrub the walls, floors, and corners of the pool, paying extra attention to areas with visible algae growth. Afterward, vacuum the pool to eliminate any loosened debris. Regular brushing and vacuuming help prevent algae buildup and maintain a clean pool environment.

  1. Filtration and Circulation

Proper filtration and circulation play a vital role in treating a green pool. Run the pool’s filtration system for an extended period, preferably 24 hours a day, until the water clears. Monitor and clean the pool filter regularly to ensure optimal performance and prevent clogging. Additionally, consider using a pool clarifier to enhance filtration and promote water clarity.

  1. Regular Maintenance and Prevention

To prevent future green pool issues, establish a regular pool maintenance routine. This includes regular testing and balancing of the pool’s chemistry, routine brushing and vacuuming, and maintaining proper filtration and circulation. Regularly inspect and clean the pool equipment, such as skimmers and pumps, and remove any debris or leaves that may contribute to algae growth.

  1. Seeking Professional Help

If you’ve followed the necessary steps and your pool remains green or the algae growth persists, it may be time to seek professional help. A pool service professional can conduct a thorough inspection, identify any underlying issues, and provide tailored solutions to treat the problem effectively. They can also offer guidance on long-term pool maintenance strategies.

  1. Conclusion

Treating a green swimming pool requires a systematic approach that includes testing and balancing pool chemistry, shocking the pool, utilizing algaecide treatments, regular brushing and vacuuming, ensuring proper filtration and circulation, and maintaining regular pool maintenance. By following these steps and addressing the root causes, you can restore your pool’s clarity and enjoy a clean and inviting swimming environment.


Q1. Can I swim in a green pool?

Swimming in a green pool is not recommended. The presence of algae can pose health risks, such as skin irritation and the potential for waterborne illnesses. It’s best to refrain from swimming until the pool water has been treated and becomes clear and properly balanced.

Q2. How long does it take to clear a green pool?

The time it takes to clear a green pool can vary depending on several factors, including the severity of the algae growth, the effectiveness of the treatment, and the size of the pool. With proper treatment and maintenance, it usually takes a few days to a week for the water to become clear.

Q3. Can I use household bleach to shock my pool?

Using household bleach as a pool shock is not recommended. Pool shock products are specifically formulated for pools and contain the appropriate concentration of active ingredients to eliminate algae and sanitize the water. Household bleach may not be effective in treating a green pool and can potentially cause other issues.

Q4. How often should I test my pool water?

Regularly testing your pool water is crucial for maintaining water balance and preventing algae growth. It’s recommended to test the water at least once a week, or more frequently during periods of heavy pool usage or adverse weather conditions. Follow the instructions provided with your pool testing kit for accurate results.

Q5. Can I prevent algae growth altogether?

While algae growth can be challenging to entirely prevent, maintaining proper pool chemistry, regular cleaning and maintenance, and adequate filtration and circulation can significantly reduce the likelihood of algae problems. Being proactive and consistent with pool care is key to preventing algae growth and maintaining a clean and clear pool.