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Kill Pool Black Algae

Algae are plants that grow in water that is not properly sanitized and they feed on sunlight and minerals in the water. Among the existing types of algae, the hardest to get rid of is the black algae because it usually grows in colonies and unless you kill it at its root, it will continue to grow and affect your pool. What is even worse about it is the fact that it will not only appear on the bottom of the pool but also in the plaster or concrete. In case it is not removed, the algae can seriously damage the pool, and although you may follow the right steps to sanitize the swimming pool, it can still grow and develop. Therefore, in case you have noticed this appearance in your pool and you want to know the exact steps to efficiently kill black algae, read the lines below and see what you have to do to eliminate this risk.

How to Kill Black Algae in Your Swimming Pool Picture 1 Image

Maintain the Filter

Since it has made its appearance in the pool, it is also possible for it to be present in the filter, so it is recommended that you clean the filter thoroughly. Also, besides the filter, it is wise to clean the pool equipment so that any possible algae to be removed and to prevent its reappearance. You should follow the steps:

  • Canister – You should empty the filter canister frequently due to the fact that it fills with debris from the vacuum
  • Check Brushes – It’s important to remove any junk from the brushes, inlets, and wheels as they will negatively affect the efficiency of the operation
  • Hose – It’s important that you always store the pool cleaner hoses flat in order to prevent kinks and knots from developing

Brush the Affected Areas

The first step you have to take is to brush the areas affected by the black algae with the help of a brush that is specially designed for your type of pool. You have to do this in order to remove the protective cover of the algae so that the chemicals used can effectively destroy the roots. Therefore, you have to firmly brush the affected areas and if necessary you can repeat this procedure for more than one time. However, make sure that you sterilize the brush after using it because it can easily grow on it.

Use a Chlorine Tablet

After you finish brushing the pool, you can use a broken chlorine tablet and scrub all the affected areas to increase the chances of killing the unwanted mold. This procedure may require more time, but you should try to do this if you want to achieve the best results. There are several ways to do it such as:

  • Floating Chlorine Dispenser – These gadgets that vary in size travel around the pool as the chlorine tablets dissolve. However, it’s very important to remember that if you have a pool liner, this isn’t the best choice for you. The reason why we’re highlighting this is due to the fact that they can get caught in one location and dispense too much in only one location
  • Pool Skimmer – This is one of the most efficient way due to the fact that when your filter is running, water will move onto the tablets. Thus, allowing the tablets to dissolve faster and evenly. The chlorinated water is then pushed into the pool. The drawback with this is the fact that the tablet can dissolve even without water going over it. Thus, it has the potential to damage your equipment
  • Chlorinated Granules – This is the pulverized version of the chlorine tablets. This is a convenient option due to the fact that you can sprinkle it all over the pool without needing to purchase extra equipment. The only drawback with this solution is the fact that you will spend a long period of time to pulverize the chlorine

Add Algaecide

This is another important step you have to take because although the algaecide does not actually harm the black algae, it helps the chlorine do its job by eliminating the protective shield of the contaminant. Therefore, add it in the areas affected by the algae, and then in the water, and let it sit overnight for best results. You should follow these steps to make it efficient:

  • Check – Make sure that the pool’s equipment is working properly. You should also adjust the pH level if the package tells you to
  • Super Chlorinate – You should increase the level of chlorine in your pool and let it sit for up to 48 hours until it goes to normal level. Do not forget that the chlorine level should be normal before you start!
  • Add Algaecide – You should add algaecide according to the instructions on the package. Follow those closely if you want to get rid of algae fast. You should let the pool sit overnight and vacuum it the next morning

How to Kill Black Algae in Your Swimming Pool Picture 2 Image

Shock the Pool

By shocking the pool you will be able to sanitize your pool and eliminate the existing algae. The most efficient way to this is to add 3 pounds of chemicals per 10,000 gallons after the sun goes down in order to prevent the UV rays from altering the chemicals in the pool. After that, you have to let the treatment for 24 hours while turning the pump off. During this time, you can brush again the pool, offering a special attention to the areas which were affected by the black algae. You should always shock the pool after:

  • Heavy and consistent pool use
  • Severe weather conditions such as a rainstorm or high winds
  • High water changes
  • Bowel-related accidents

Vacuum the Pool

Vacuuming the pool after the previous steps will help you perform the normal cleaning task, but it will also help you eliminate the dead algae. In this way, your pool will be clean and you will be able to eliminate any existing dead particles. To make your work less tiring, what we recommend is for you to invest in a robotic pool cleaner that will handle vacuuming the surfaces of the pool for you. Best of all, this type of cleaning robot can handle filtering the water of the pool as well, thus both the surfaces and the water will be clean and free of debris of all kinds. Therefore, the chances for this problem to appear will be greatly reduced. Just program it to start cleaning the pool on a daily basis, and you won’t ever have problems of this kind.

Repeat the Process if Necessary

In case you notice that black algae are still present in the pool, it is recommended that you repeat the entire process until you achieve the desired results. As we have mentioned before, removing it is quite difficult and it usually requires more time until it is completely eliminated.

Logan Hewitt
Logan Hewitt
Logan was born and raised in Bakersfield, California, one of the most affected American cities by pollution, experiencing firsthand the phenomenon’s dangers. He worked in retail for a small electronics shop for 5 years, where he had his first experience with air purifiers. With his interest in technologies that are meant to improve life quality and the technical skills he gained with the passing of time, Logan is able to provide readers with in-depth analysis of life-changing devices.