What Causes Pool Water To Be Blue? [Expert Review!]

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If you spend any time at all in a pool, then it’s likely that you’ll encounter a blue tint. Even if the pool water is crystal clear, you’ll most likely see a small hint of blue. Some people even get a tinted vision when looking into the water at certain times of the day. This can be a bit disconcerting if you’re not expecting it, but it’s all part of the beauty of a pool.

What causes pool water to be blue? There are many possible causes for this phenomenon, but we’ll discuss the most common factors here.


The first and most obvious reason for blue pool water is direct sunlight shining on the surface of the water. When sunlight hits the water, it’s mostly reflected back down toward the earth. However, a small portion of this sunlight makes it into the air around the pool. When this happens, it’s known as ‘photosynthesis’. This is where plants get their nutrients from, and the gas that they use to protect themselves from predators is oxygen.

When sunlight is reflected back down from the surface of the water, it has a warming effect on the water. Warmer water glows a darker shade of blue than cooler water. Thus, if you want to change the color of your pool’s water, then the best thing to do is add some solar shade structures above the pool.


Another thing that can affect the color of pool water is the placement of the pool itself. If the pool is located in a region with a lot of sunlight, then it’s a good idea to put up some sort of a canopy above the pool. This will block a lot of the sunlight, causing the water to be a little bit cooler. You could also add some overhangs that extend over the pool area, creating a covered patio. These are two options that will help to reduce the intensity of the sun’s heat, making the pool water appear a little less blue.

Water Chemistry

The pH level of the pool water also makes a difference in how it will appear. Most pools need to be between 7.2 and 8.4 to prevent any buildup of minerals or chemicals. If the pH level of the water is too high or too low, then this can result in a number of issues, ranging from algae blooms and cloudy waters to acid and metal stains. It is advisable to have your pool water tested at least once a month, and to make any necessary adjustments to ensure its perfect pH balance.


Some pools are equipped with a mechanical or digital filter system. These help remove solid objects from the water. Clogged filters can cause a number of issues, ranging from slow draining to the pool not appearing clear at all. Solid particles that are caught by the filter are too big for most aquatic creatures to consume, so this means that they’ll eventually end up in the pooling area. This, in turn, could lead to various health problems.

Whether you decide to employ a pool filter or not, it’s a good idea to check for blockages regularly. You can do this either by removing the filter and having a look or by checking for debris at the bottom of the pool. Whatever the case, be sure that your pool is free of obstructions.


Algae is another thing that can affect the color of your pool’s water. This is an organism that needs sunlight to live and grow, so if you want clear pool water then it’s a good idea to get rid of any algae that might be present. One of the best ways to do this is with some sort of algae-blasting device known as a water polisher. Just make sure that you’re careful when using these types of products because if they’re not labeled as safe for swimming then they’re probably not meant to be immersed in water.

Fruit And Veggie Scavengers

Algae doesn’t just live in ponds and lakes, it can also be found in tropical regions where there’s a lot of rain, especially during the summertime. Some algae species are known to eat anything that’s solid or in the water, and this includes plant matter, algae, and even other types of microorganisms. If you’re growing fruit and vegetables in the area surrounding the pool then it’s a good idea to keep an eye out for these scavengers. If you see any evidence of them eating away at your poolsheet, then it’s time to call in a professional.

Frequency Of Cleaning

Another thing that can affect the color of pool water is the frequency of its cleaning. If you regularly clean your pool with chemicals then this will make the water appear more blue because there will be less organics at the bottom of the pool. However, if you clean it with water only a few times per year, then this can result in algae blooms and other types of microorganisms that live in the water.

The frequency of your pool’s cleaning will depend on a variety of factors, ranging from the size of the pool to how often you use it. The best thing to do is clean it as often as necessary, with the proper amount of chemicals, and at the right pH level. Keeping your pool clean is a very important part of keeping it looking good, so don’t be afraid to do this often.

There are many possible causes for pool water to be blue. However, the ones discussed here are the most common ones. Of course, if you want to change the color of your pool’s water then you have several options, ranging from simple to complex. The choice is yours.

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