How to Rid Your Pool of Algae

No matter how hard you try, this is a problem which will constantly appear in your home swimming pool because they rapidly spread in warm water. Whether it’s brought by wind, rain or people entering your swimming pool, it immediately spread and become a real headache when it comes to pool cleaning. Fortunately, there are some efficient methods that can keep them away from your pool and we reveal these methods below so you can enjoy a clean pool all year long.

What Type of Seaweeds are You Dealing With?

There are various types of algae that grow in your pool and the best way to rid it is to identify the type in your pool. The most common are the green ones that are often seen floating on the surface of the water or on the walls, which makes the water look sort of green. The yellow type can also be found on walls but it usually develops in shady parts of the pool. It’s very dangerous and must be handled as soon as you spot it. The hardest to deal with is the black type that sticks to your pool through some roots that make it very hard to remove. Once your pool develops this problem, it will keep coming back and it’s very hard to get rid of. The last type and the rarest is the pink one, a type of fungus usually found in cracks and corners of the pool and is much easier to remove.

Why do I Have Seaweeds in My Swimming Pool?

Where there is water, there is also this unpleasant problem. That’s why pools should be treated with chemicals to ensure algae and bacteria don’t get into your water. They usually grow in your swimming pool because it hasn’t been treated with chlorine or other sanitizing chemicals. Also, it’s very important to keep the pool’s water moving with a filter and pump. When the water stagnates and your pool is lacking sanitation, you will always have this problem. On the other hand, when the water is moving, it’s very hard for then to grow in it. Usually, they grow in dark spots, including under your ladder, corners, creases, crevices and on your pool steps. Usually, these spots don’t get much water circulation and are great places for them to feed and multiply. So now that you have information of what type they are and why they form, you must destroy them all.

What Can You do About it?

After detecting the type of algae in your swimming pool, it’s time to start working on removing it once and for all. You can rely on the help of several pool cleaning tools and substances that attack them and make them go away.

  • The most common and affordable way is to scrub the pool with a pool brush with tough bristles that will be able to remove those one stuck on the pool walls and floor. If your pool is made of concrete, you can use a steel brush and for a vinyl or fiberglass pool, it’s best to use a nylon brush.
  • If you are not in the mood for brush scrubbing, let a robotic pool cleaner do the hard work with its hard brushes and the smart navigation technology that enables it to move around the entire pool. Robotic pool cleaners are great devices that can scrub off dirt and bacteria from the pool’s surface and absorb all the impurities, leaving the water clean and safe for swimming.
  • Your pool water pump can be of great use in removing bacteria that float above the water. Turn the pump on and leave it for 24 hours to make sure it removes all the water in the pool. In the meantime, backwash the filter as many times as possible to eliminate excess these plants collect.



  • Before you add any pool chemicals into the water, check its pH levels to ensure that the chemicals will work properly. Use tests strips on the water to determine the pH level that should be between 7.2 and 7.6, the alkalinity that should not exceed 120 ppm and the calcium levels that should be between 200 and 400 ppm. Having the right water levels means the chemicals added will do a good job in removing them. The above video will show you how to properly test your pool water.
  • Using algaecide is the fastest and easiest way to get rid of these green pool plants in your swimming pool. You can choose a quaternary substance based on ammonia or a metallic one made of silver and copper. The quaternary one is the most popular because it’s less expensive and it doesn’t stain the pool. When choosing algaecide, opt for one with a concentration of at least 30% so it will be powerful enough to fight them. Also, choose one that has been specifically designed to fight against the black one which is the toughest type to remove.
  • Add a chlorine solution to the pool water to rid of it, a process called shocking the pool water that implies adding chlorine granules to the pool in order to kill existing bacteria. Depending on the amounts of bacteria in your water, you can double, triple, or quadruple-shock your pool for increased efficiency. Do so by mixing some chlorine granules with water before adding the mixture to the pool. For better results, shock the pool after using algaecide in your pool and then have the robotic vacuum eliminate their residues.

Prevent their Apparition with a Robotic Pool Cleaner

Keeping the pool clean is the most important step to ensuring that the horrid pool seaweeds that we have talked about in this article won’t appear. Of course, it’s equally important to keep normal pH levels and to ensure that the right amount of chemicals goes into the water, but cleanliness still remains at the top of your priorities. We are aware of the fact that few pool owners have the time to properly clean their pools daily, but this problem can easily be solved with the addition of a robot pool cleaner. By purchasing a unit that can be scheduled to daily clean the pool, you ensure that dirt, debris, and other contaminants won’t lurk in the water, thus preventing their apparition. Best of all, you won’t have to lift a finger to clean the pool, so you can’t complain about maintenance work.

How It Affects Your Health

As eager as you might be to jump in the pool, if it has this problem, it’s best to stay away from swimming until the problem gets fixed. To better understand why it is so dangerous to swim in a pool that has these problems, read about the health effects that will inevitably appear:

  • Pools that have such a problem promote harmful bacteria growth. This is caused by the fact that these plants survive solely through the process of photosynthesis. Therefore, the plant absorbs carbon dioxide and it releases oxygen. Unfortunately, aerobic bacteria, such as E. Coli, thrive in the presence of oxygen, using it to grow. As the bacteria will feed on the oxygen and spread rapidly throughout the pool, it will become hazardous for you to swim in the water, side effects such as vomiting, nausea, and even diarrhea making an unwanted appearance.
  • If you were to swim in such a pool, the first thing that you will notice when getting out is that your skin has become slimy. This happens because they attach to your body and even to your swimming garment. This might not present a huge danger to your health, but it’s still unhygienic. Therefore, it’s mandatory for you to take a shower as soon as you get out to prevent any infection from appearing. Also, make sure that you wash the garment before you ever wear it again.
  • When they invade the pool, they coat every surface. This causes the floor, ladder, and the walls to become very slippery, meaning that there are increased chances for you to get injured. While this might not be a direct health effect, it’s still recommended to be cautious and avoid entering the water to not sustain any major injuries.

12 Comments

  1. Angelo says:

    Will cleaning the pool regularly with a robotic pool cleaner help prevent the appearance of algae?

  2. Edward says:

    I have yellow algae in my pool, and I want to get rid of this problem. How do you recommend I proceed?

    • Carl Hudgens says:

      To get rid of the nasty yellow algae that have appeared, we advise you to first clean the pool with a brush that has tough bristles. Afterward, turn on the pump and let it remove all the water in the pool. Next, fill the pool with clean water and add a potent algaecide that will surely eliminate this problem once and for all.

  3. Bruno says:

    Should I use a robotic cleaner if I used algaecide?

  4. Erik says:

    Can I swim with algaecide?

    • Becky Eddinson says:

      As you probably know algaecide is used to shock and kill algae using strong chemical compounds. Swimming during algaecide treatment depends on the type of product used. Some of them are safe for immediate swimming, while others can cause slight eye or skin irritation. However, it’s recommended to follow the manufacturer’s instructions, in order to avoid problems.

  5. Claire says:

    Hello, I have algae in my pool. Is it harmful to my body?

  6. Darcy says:

    What is the best way to remove the algae out of a 10 ft above ground pool?

    • Becky Eddinson says:

      In order to remove the algae, you need to use flocculant and a vacuum cleaner that can vacuum the pool. If you still have any algae after, repeat the process the next day. However, do not with the amounts of flocculant as it is poisonous.

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