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why swimming pool turns green


Author: Poolking - Swimming Pool Equipment Manufacturer

Why Swimming Pool Turns Green

Are you tired of your pool turning green every time you leave it unattended for even a couple of days? This can be frustrating, and you may feel like you're constantly fighting a losing battle. But before you throw in the towel and fill in the pool for good, it's essential to understand why this is happening in the first place. In this article, we'll go through the main reasons why your swimming pool turns green.

Algae Growth

One of the most common and obvious reasons why your pool turns green is algae growth. Algae are tiny plant-like organisms that thrive in warm, shallow waters. They can enter your pool in many ways, including rain, wind, and even on the skin of swimmers. Once they find a comfortable spot to grow, they can reproduce quickly, turning your pool into a green, murky mess.

Chemical Imbalance

Another reason why your pool might turn green is a chemical imbalance. To keep your pool clean and clear, you need to maintain the proper chemical balance. This includes a balance of pH, chlorine, alkalinity, and calcium hardness. If any of these levels are too high or too low, it can throw off the delicate balance, leading to cloudy or green water.

Poor Circulation

A third reason why your pool might turn green is poor circulation. If the water isn't circulating correctly, it's not getting the proper filtration and chemical distribution it needs. This can lead to stagnant water, which is a perfect breeding ground for algae and bacteria.

Dirty Filter

Your pool's filter is designed to trap and remove impurities from the water. If it's dirty or clogged, it can't do its job correctly, leading to cloudy or green water. It's essential to clean and maintain your filter regularly to ensure it's working properly.

Lack of Sanitation

Finally, a lack of sanitation can also cause your pool to turn green. If you're not keeping up with the maintenance of your pool, it can quickly become a breeding ground for bacteria and other harmful organisms. This can lead to an unsafe swimming environment and even result in infections.

How to Prevent Your Pool Turning Green

Now that you understand why your pool might be turning green, it's time to take action to prevent it. Here are some tips to help you keep your pool clean and clear all season long:

- Maintain proper chemical levels: Test your water regularly and adjust chemical levels as needed to ensure a proper balance.

- Keep up with maintenance: Regularly clean and maintain your pool's filter, and skim and brush the walls and floor of the pool.

- Ensure adequate water circulation: Make sure your pool's pump and filter are sized correctly for your pool and running long enough each day.

- Shock your pool: If you notice your water starting to turn green, shock your pool with a heavy dose of chlorine to kill any algae or bacteria present.

- Keep your pool covered: Use a pool cover when not in use to prevent debris and other contaminants from entering the water.


In conclusion, a green pool can be a frustrating and unsightly problem. But with some understanding and preventive maintenance, you can keep your pool clean and clear all season long. Remember to test your water regularly, maintain proper chemical levels, clean and maintain your filter, ensure adequate water circulation, and use a pool cover. By taking these steps, you can enjoy a beautiful, crystal-clear pool all summer long.


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