How To Get Rid Of Black Spot In Swimming Pool? [Facts!]

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Are you looking for ways to make your swimming pool match the outdoors? A large part of the appeal for swimming pools is that they are a place that you can leave outdoors. However, there is usually one thing that you may not want to leave outside of your home – the black spot! What is a black spot and how did it get its name? Let’s find out together.

What Is A Black Spot?

If you have ever taken a swim in a pool, you may have noticed that there is one place in particular that you cannot escape. This is the place where the water becomes completely black as it meets the surface of the pool. It is important to note here that the water does not need to be completely pitch black in order to have a black spot. A small amount of settling matter or a large amount of crude oil or grease may be floating in the water, causing it to turn a certain color. For the sake of this article, we will assume that the water is completely pitch black.

How Did It Get Its Name?

The name of this phenomenon is actually quite fitting. As you may have guessed, a black spot is the result of something that occurs almost entirely beneath the surface of the water. If you are lucky enough to notice one, you will see that the water is completely still there as well. The only movement that you may notice is the ripples caused by someone or something jumping in or out of the water. As there is rarely any visible indication of what caused it, this is why it is commonly referred to as the “black spot” in the pool. It is important to note here that while it is fitting that this phenomenon has a name, it is not totally accurate. The truth is that there is rarely any one single cause of a black spot. More often than not, it is simply the result of a combination of factors.

What Are The Possible Reasons For A Black Spot In The Pool?

While it is not yet known exactly what causes a black spot in a swimming pool, there are certain factors that have been tied to it. One of the main factors is, undoubtedly, oil. Oil is, unfortunately, quite common in water sources, especially swimming pools. It tends to accumulate there over time due to water evaporation and the breakdown of natural chemicals such as plant and animal life. In some cases, it can also be a cause of blockages that lead to poor water quality. In any case, oil in the water is usually a recipe for disaster, especially if it is not removed regularly. Another cause could be dirt. Just like oil, dirt is also another common hindrance to the water quality of swimming pools. It too readily accumulates at the surface of the water, causing the usual murky appearance that you may have seen in other pools. In some cases, the dirt can also be a cause of algae growth, which will then stain the water completely black. In other cases, it could be a source of fungus growth, which will then lead to the infection of those in the area and, ultimately, their deaths. The list of possible causes of a black spot in a swimming pool is really quite extensive, so be careful where you swim and what you eat while in the pool!

How Do You Get Rid Of A Black Spot In The Pool?

If you are aware of the main causes of a black spot in the pool, you can easily take preventive measures against it. First, you should ensure that the water is always clean by removing all debris from it. In the case of oil, this means that you should drain the pool completely and clean it thoroughly, including the walls and floors. You should also ensure that the filter in your pool is changed regularly and oil removed from it. In some cases, it may also be necessary to install an additional sub-surface pump to remove as much oil as possible. Second, you may want to consider replacing the dirt with sand, as it will not only improve the aesthetic appearance of the pool but also ensure better traction when swimming. Third, if you suspect that algae is causing the spot in the water to grow to an unhealthily large amount, you should consult with a professional algae removal specialist to ensure that this does not happen. In terms of maintaining the cleanliness of your pool, these are some pretty universal measures that you can take. As for the actual methods of removing the black spot, there are several different ways to go about it. Let’s find out about a few of them.

Regular Cleaning

As we mentioned above, one of the main causes of a black spot in a pool is oil. If you are regularly cleaning your pool, you should ensure that all the nooks and crannies that are hidden underneath are scraped clean. This is important because even though the water may look spotless, there is always the chance that there is still some oil that got missed by you during the cleaning process. So, while a little bit of oil may not be a problem itself, it could become one if you don’t clean it regularly. Another way to look at this is if you are cleaning the pool once or twice a month, there is a chance that your cleaning solution may be carrying some oil that is simply left over from the last time you cleaned the pool. You should be aware of this and ensure that it is not accumulated in any way. Otherwise, this could become an even bigger problem than it already is. To remove the oil, you should always make sure to test the water for oil prior to entering it in any way. This can be done by simply adding a few drops of oil-sensitive liquid as part of your cleaning solution and letting it sit for a minute or two before testing the water for oil. If you find any trace of oil in your water, it means that there is still some accumulated there from the previous cleaning session. In this case, it is quite likely that more frequent cleansings will be necessary to completely remove the oil. Always bear in mind that too much oil in the water can lead to serious health problems for both you and your pool’s denizens. To avoid this, you should regularly cleanse the pool water. Fortunately, once you remove the oil, it is quite simple to prevent future accumulation by ensuring that the water is cleaned regularly and correctly. To avoid any problems, it is always a good idea to consult with a professional pool cleaning company who has the equipment necessary to effectively clean your pool regardless of its size or shape.


If you are using a filter in your pool to trap solid matter, you should clean it regularly and remove any debris that builds up around the filter. In the case of a purple ringed reticulate filter (PRRF), you should ensure that this ring is clean and unobstructed at all times. Even if it is not visibly apparent that something is blocking the ring, you should periodically clean it to ensure that it remains unobstructed and that no foreign matter builds up within it. To do this, you simply need to remove the top portion of the tank and wash out all the debris that has collected there over time. It is quite simple to do this and, once done, your pool will be at its best!

Pellet Cleaning

Pellet cleaning is quite simply the practice of removing debris from the water by using a cleaning rod with bristles at the end. The rod is actually immersed in the water and turned via a handle, which causes the bristles to beat against the sides of the pool, removing any debris that may be in the water. This process is usually done once or twice a month in order to ensure that the water remains clean and clear of any debris. To remove any debris that was not previously removed via the aforementioned methods, you should use a net to strain the water and remove any large objects that may be present there. It is quite important to note here that while it is quite easy to use pellets to clean your pool, it is also quite easy for them to become clogged up with debris. To avoid this, you should always clean your pool with the utmost care and ensure that all the bristles are completely removed from the cleaning rod prior to using it again. In some cases, it may also be necessary to replace the entire unit of the cleaning rod due to excessive wear and tear. In this case, it would be best to consult with a professional pellet company who can advise you on the proper way to maintain your pool and ensure that it remains clean and clear of any debris at all times!

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