Understanding Algae on Pool Walls: Causes, Prevention, and Treatment

By Algal Web

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Swimming pools are the perfect place to relax and unwind during the hot summer months, providing a refreshing escape from the heat.

However, owning a pool comes with a set of responsibilities, including regular maintenance to ensure the pool is clean and safe for swimming. One of the most common issues pool owners face is the growth of algae on pool walls.

Algae not only looks unsightly, but it can also create a health hazard for swimmers. Algae is a type of aquatic plant that thrives in warm and humid environments, making it the perfect breeding ground for the growth of algae in pools.

In this article, we will take a closer look at the causes of algae growth in pools, as well as the different prevention and treatment methods available to keep your pool walls clean and safe.

We’ll cover everything from proper maintenance and chemical balancing to specific treatments for removing algae from pool walls.

With a little effort and attention to detail, you can keep your pool in top condition all summer long, providing a refreshing escape for you and your family.

Causes of Algae on Pool Walls

Algae is a type of aquatic plant that thrives in warm and humid environments. There are several types of algae that can be found in swimming pools, including green algae, yellow or mustard algae, and black algae.

The most common type of algae found on pool walls is green algae, which is usually caused by inadequate sanitation, poor water circulation, and insufficient maintenance.

Other factors that can contribute to the growth of algae on pool walls include:

  • High temperatures: When the water temperature in a pool is consistently high, it creates the perfect environment for algae growth. This is why it’s important to maintain a proper water temperature in your pool.
  • Lack of Chlorine: Chlorine is an essential chemical used in swimming pools to kill bacteria and other harmful organisms, including algae. If there isn’t enough chlorine in the pool, algae can quickly take hold and start growing on the walls.
  • Inadequate sanitation: Proper sanitation is crucial for preventing the growth of algae in swimming pools. If the chlorine or other sanitizing chemicals in your pool are not at the appropriate levels, it can create an environment that is conducive to algae growth.
  • Imbalanced Pool Chemistry: If the pH level of your pool is too high or too low, it can create an environment where algae can grow. This is because algae thrive in environments where the pH is not balanced.
  • Lack of water circulation: When the water in a pool is stagnant or not circulating properly, it can create stagnant areas where algae can grow. Proper water circulation is important for keeping your pool walls clean.
  • Inadequate maintenance: Regular pool maintenance, including cleaning the walls and checking the chemical levels, is essential for preventing algae growth.
  • Debris: Dirt, leaves, and other organic matter can accumulate in your pool and provide a breeding ground for algae. Regular cleaning and maintenance can help prevent this from happening.
pool algae
Image Credit: spamarvel.com

Prevention of Algae Growth

Preventing the growth of algae on pool walls is much easier than treating it after it has already appeared. Here are some tips for preventing algae growth in your pool:

  • Regular pool maintenance: Regular maintenance is key to preventing algae growth in your pool. Make sure to clean the walls and floors of your pool regularly, and test the chemical levels of your pool water frequently.
  • Proper water chemistry: Maintaining proper water chemistry in your pool is essential for preventing algae growth. Make sure to keep the pH level between 7.2 and 7.8, and the chlorine level between 1 and 3 ppm.
  • Adequate filtration and circulation: Proper filtration and circulation are important for keeping your pool walls clean. Make sure your pool’s filtration system is working properly, and run your pool pump for at least 8-10 hours a day.
  • Use a pool cover: Using a pool cover when your pool is not in use can help prevent algae growth by reducing the amount of sunlight and debris that enters the pool.

Treatment of Algae on Pool Walls

If algae growth does occur on your pool walls, there are several treatment methods available. Here are some of the most common methods for treating algae on pool walls:

  • Algaecides: Algaecides are chemicals that are specifically designed to kill algae. There are different types of algaecides available, including copper-based and non-copper-based algaecides. It’s important to follow the instructions on the product label when using algaecides.
  • Brushing the walls: Brushing the walls of your pool can help remove algae and prevent it from spreading. Use a stiff-bristled brush to scrub the walls, and make sure to brush the walls and floor of your pool thoroughly.
  • Shock-treating the pool: Shock-treating your pool involves adding a large amount of chlorine to the water in order to kill the algae. This is usually done when the algae growth is particularly severe. It’s important to follow the instructions on the shock treatment product carefully to ensure that you don’t damage your pool.
  • Vacuuming the pool: Vacuuming the pool can help remove dead algae and prevent it from spreading. Make sure to use a pool vacuum that is designed for your specific type of pool.

Safety Precautions

When treating algae on pool walls, it’s important to take safety precautions to protect yourself and others. Here are some safety tips to keep in mind:

  • Wear protective gear: When handling chemicals like algaecides and shock treatments, make sure to wear protective gear, including gloves, goggles, and a mask.
  • Ensure proper ventilation: Make sure the area where you are treating your pool is well-ventilated to prevent the buildup of fumes.
  • Store chemicals properly: Keep all pool chemicals out of reach of children and pets, and store them in a cool, dry place.


Algae growth on pool walls is a common problem that can be both unsightly and potentially harmful. However, with proper maintenance and treatment, it can be easily prevented and treated.

By following the tips in this article, you can keep your pool walls clean and safe, and enjoy your pool all summer long.

Remember to stay safe when using chemicals to treat algae, and always follow the instructions on the product label carefully.

Additional Posts

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  2. Mustard Algae in Pool: Causes, Prevention, and Treatment
  3. Pool Algae Stain Remover: Say Goodbye to Unsightly Algae Stains in Your Pool
  4. Is Pool Algae Harmful to Humans: Everything You Need to Know
  5. The Importance of Managing Dead Pool Algae in Ponds and Lakes