GREEN POOL WATER: CAUSES, SOLUTIONS AND HOW TO PREVENT IT

Is your pool water turning green? Don’t wait for the problem to get worse.
With the right treatment and regular maintenance, getting your pool clean and crystal clear again is easier than you might think.

When pool water starts to turn green, it’s a sign that something isn’t working as it should.
But why does it happen, and what can you do to get your pool water crystal clear again?

Green pool water can be caused by an unbalanced pH, insufficient filtration, inadequate disinfection or poor maintenance. But there’s another factor that often goes unnoticed: phosphates.

The good news is that green pool water can be treated.
Acting quickly is key to restoring clear water faster and preventing the problem from becoming more difficult to manage.

Discover the most common causes of green pool water, the steps to restore clean, clear water and the best tips to prevent the problem from coming back.

What are the most common causes?
Green pool water can occur for several reasons:

Insufficient or inadequate disinfection.
An unbalanced pH, which can reduce the effectiveness of the disinfectant.
Insufficient filtration or a filter that needs maintenance.
High temperatures and long periods of sunlight, which encourage algae growth.
Poor cleaning and maintenance, leading to a build-up of leaves, dirt and organic debris.
High phosphate levels, which provide nutrients for algae and can encourage their growth.

Phosphates: the invisible food source for algae

Phosphates can enter your pool water through fill water, fertilisers, dirt, leaves, organic debris and other sources.

Phosphates are nutrients that algae can use to grow. So, if your pool repeatedly develops algae despite proper disinfection, checking the phosphate level can help you understand what is causing the problem.

How to restore a pool with green water
The sooner you act, the easier it will be to restore the water.

Start by testing the water and checking the main parameters, including alkalinity, pH, disinfectant levels and phosphates.
If phosphate levels are high, a specific phosphate-removal treatment may be considered. This means you’re not only treating the algae that are already present, but also addressing one of the nutrients that can encourage their growth.
Next, clean and brush the pool walls and floor to remove algae attached to the surfaces, then apply the appropriate treatment depending on the condition of the water and the type of algae present.
It is also important to check the filtration system, clean the filter and keep the filtration system running for the necessary amount of time to help remove suspended particles.
If the water remains cloudy, additional treatments such as pool clarifiers can help restore its clarity.

How can you prevent your pool water from turning green again?
Prevention is essential, especially during the warmer months.

Regularly checking the pH and disinfectant levels, maintaining good filtration and brushing the pool surfaces regularly are essential maintenance habits.
And if algae keep coming back, don’t just focus on chlorine: testing the phosphate level can help identify the underlying cause.
To make pool maintenance easier, you can also consider solutions such as robotic pool cleaners, salt chlorination systems or automatic water analysis and control systems.

Don’t know why your pool is turning green or what treatment it needs?
Bring us a water sample.

At any Neda Pool&Spa store, we offer a FREE WATER ANALYSIS. We’ll help you understand the results and tell you which treatment your pool needs, the appropriate dosage and the steps to follow to restore clean, balanced and crystal-clear water.

Bring us your water sample and let us help you find the right solution.

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