A green pool is usually a sign of algae growth, which is caused by improper water chemistry, lack of sanitation, or poor filtration. As a homeowner with a pool, it is a good idea to do your research so you can keep your pool in tip top shape. You can also hire a qualified pool specialist such as Aqua Clear Pool Care, either to help out or take over your pool care.

Here’s why your pool might be green and how to fix it.

Why Is Your Pool Green?

Algae Growth: Algae thrive in warm, stagnant water, especially when chlorine levels are low. This causes the water to turn green, and if left unchecked, the algae can quickly spread.

Low Chlorine Levels: Chlorine is the primary sanitizer in your pool that kills bacteria and algae. If your chlorine levels drop too low, algae can grow, turning the water green.

Poor Filtration: If your pool filter isn’t working properly or running long enough, it won’t effectively remove debris and algae spores, leading to cloudy or green water.

Unbalanced pH and Alkalinity: pH and alkalinity levels that are too high or too low can impact the effectiveness of chlorine, leading to algae growth. Maintaining balanced water chemistry is crucial for preventing a green pool.

Warm Weather: Warm temperatures, combined with low chlorine levels, can create the perfect environment for algae growth. Heat accelerates the growth of algae and bacteria, making pool maintenance more challenging in the hottest months.

    How to Fix a Green Pool

    Test the Water: Before treating your pool, test the water’s pH, alkalinity, and chlorine levels using a test kit. This will help you understand which chemicals need adjusting.

    Shock the Pool: Shocking a pool means adding a high dose of chlorine to kill algae and bacteria. Use a pool shock treatment, following the manufacturer’s instructions based on the size of your pool. You may need to shock the pool more than once if the water is very green.

    Brush and Vacuum the Pool: Brush the walls and floor of the pool to remove algae and debris. This helps loosen algae so it can be filtered out. After brushing, use a pool vacuum to remove dead algae from the bottom of the pool. You can find automatic vacuums to make the job easier.

    Run the Pool Filter: Keep the filter running continuously until the water clears up. A properly functioning filter helps remove dead algae and keep the water clean. Check the filter regularly and clean it as needed, especially if the pool was very green.

    Balance the Water Chemistry: Once the pool starts clearing, test the water again and adjust the pH, alkalinity, and chlorine levels to the recommended ranges. A balanced pool prevents future algae growth and keeps the water clear.

    Algaecide (Optional): In cases of persistent algae, you can add an algaecide after shocking the pool. Algaecide helps kill any remaining algae spores and prevents future outbreaks.

    Regular Maintenance: After you’ve restored the pool’s clarity, ensure regular maintenance by keeping the chlorine levels consistent, cleaning the filter, and balancing the water chemistry. Regular brushing, vacuuming, and checking the pool’s circulation will prevent algae from returning.

      By addressing the underlying causes of a green pool and maintaining proper water chemistry, you can restore your pool to a clear, blue state and keep it that way all season long.