How to Remove Algae Stains from Pool Walls

Having algae stains on your pool walls can be unsightly and can negatively impact the overall appearance of your pool. However, with the right methods, you can effectively remove these stains and restore the cleanliness of your pool. In this article, we will guide you through step-by-step instructions on how to remove algae stains from pool walls, ensuring that your pool remains beautiful and inviting.

How to Remove Algae Stains from Pool Walls

Algae stains can occur on pool walls due to various factors such as poor water circulation, inadequate sanitation, or imbalanced chemical levels. It’s important to address these stains promptly to prevent further growth and potential damage to the pool surfaces. Here are several effective methods to help you remove algae stains from your pool walls.

Scrubbing the Affected Areas

The first step in removing algae stains is to scrub the affected areas thoroughly. Use a pool brush and apply firm pressure in a circular motion. This mechanical action helps to loosen the algae debris from the pool surfaces. For stubborn stains, you may need to use a wire brush, but be cautious not to damage the pool walls in the process.

Using a Borax Paste

Borax is a natural cleaner that can be effective in removing organic stains, including algae stains. To create a borax paste, mix borax powder with water to form a thick consistency. Apply the paste directly to the algae stains and scrub gently using a soft-bristled brush. Allow the paste to sit for a few minutes before rinsing it off. This method can be particularly useful for mild to moderate algae stains.

Checking and Adjusting Chemical Levels

To prevent the recurrence of algae growth, it is crucial to maintain proper chemical levels in your pool. Test the water to determine the current levels of chlorine, pH, and other chemical parameters. If necessary, shock the pool by adding a higher dose of chlorine or algaecide than usual. The specific dosage will depend on the type of algae you are dealing with. Regularly monitor and adjust the chemical levels to keep your pool water properly balanced.

Using an Organic Stain Remover Product

There are stain remover products available on the market that are specifically designed to tackle algae stains. One such product is Lo-Chlor Multi Stain Remover, which not only works on algae stains but also on stains caused by other conditions. Before using any stain remover, carefully read and follow the instructions provided by the manufacturer. In some cases, you may need to lower the pH and chlorine levels of your pool before applying the stain remover. Allow the product to work for the recommended time, then filter the pool as you would normally do.

Draining and Applying Muriatic Acid

If none of the above methods prove successful in removing the algae stains, you may need to resort to draining your pool and using muriatic acid. Before attempting this method, it is essential to exercise caution and ensure your safety. Wear protective gear such as gloves and goggles, and follow all safety instructions when handling muriatic acid. Dilute the acid according to the manufacturer’s guidelines and apply it to the walls and bottom of the pool. Allow the acid to sit for a short period, then scrub the walls with a brush. Rinse the pool thoroughly and refill it with fresh water.


Algae stains on pool walls can be a common issue, but they can be effectively addressed with the right techniques. By following the steps outlined in this article, you can remove algae stains from your pool walls and restore its pristine condition. Remember to take precautions when handling chemicals and always consult a professional if you have any doubts or concerns.


Q1: Can I use bleach to remove algae stains from pool walls? A: While bleach can be effective in killing algae, it is not recommended for removing stains from pool walls. Bleach can damage the pool surfaces and may lead to more extensive problems.

Q2: Is it necessary to drain the pool to remove algae stains? A: Draining the pool is not always necessary. Try the other methods mentioned in this article first before considering draining and applying muriatic acid.

Q3: Can I use a pressure washer to remove algae stains? A: Pressure washers are not recommended for removing algae stains from pool walls. The high-pressure water can damage the pool surfaces and may not effectively remove the stains.

Q4: How often should I check the chemical levels in my pool? A: It is recommended to check the chemical levels in your pool at least once a week. Regular monitoring and adjustment of the chemical levels are essential for maintaining a clean and balanced pool.

Q5: Can I prevent algae stains from forming in the first place? A: Yes, you can prevent algae stains by practicing regular pool maintenance, including proper sanitation, circulation, and routine cleaning. Regularly brushing the pool walls and floors can help to prevent the buildup of algae.

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Camilo Kawas is a seasoned entrepreneur and expert in the field of commercial cleaning, with a specific focus on clothes, carpet cleaning and floor care. With a profound understanding of the importance of selecting the right products for effective stain removal from clothes, Camilo has established himself as a trusted authority in the industry.

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