Why Won’T My Pool Water Turn Blue? [Answered!]

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We read about blue pool water in the U.S. more and more these days. The strange thing is that the blue color usually occurs in areas with lots of rainfall. It’s not uncommon to find rain-fed pools that are blue! But why is that?

The color represents a high concentration of chlorophyll, which in turn, indicates that there’s lots of life in the water. Most people are completely unaware that their pool’s water can become this distinct color. We thought it’d be useful to explore the causes of this phenomenon so you can be more mindful about the water that you’re using.

The Reason For The Blue

The color occurs when a blue pigment, usually indigo, mixes with the water. This pigment is added to the water to make it more opaque. The result is that less light penetrates to the water’s bottom. As a consequence, the light becomes bluer. You can actually see this effect when you place a small quantity of water in a glass. The bottom of the glass will turn blue because less light is able to penetrate it. This is why your pool’s water will turn blue during a heavy downpour!

If the water is allowed to remain undisturbed for some time, the color will fade. But it will never disappear completely. There is always some residual presence of blue pigment in the water. Even when the pool is not particularly deep, you will find that a small section of the water near the surface becomes saturated with this color. This is also due to the fact that when there’s heavy rainfall, the runoff water washes over the pool area and washes down the wall, incorporating all the chemical components of the soil. So even when the sun begins to dry out the pool area, the water will remain saturated with blue pigments!

How Long Does It Take For The Color To Disappear?

The precise amount of time that it takes for the color to disappear depends on the concentration of the pigment and the depth of the pool. You should be able to notice a difference within a few days of adding the substance. But it takes about a week to a month for the water to return to its original color. During this period, the sun’s rays will continue to break down the dissolved substances in the water, restoring it back to its pristine condition.

What Are The Consequences Of Adding This Substance To The Water?

Adding indigo to the pool water has several advantages! First, it adds a little bit of life to the water. You’re not completely sterile of all the living creatures that you might encounter while swimming in the pool. Second, it filters out all the harmful UV rays from the sun, reducing the risk of skin cancer. Finally, the color will not attract any animals or birds, which might otherwise consider the pool as a source of food!

Indigo offers several advantages to the pool owner, but it also has some disadvantages. If you decide to add this substance to your pool, you must ensure that the water is changing constantly. You never want to let it become stagnant or the beneficial effects of the indigo will be nullified. For this reason, you should add some every week or every other week. Also, when adding this substance, you should ensure that all the dirt is washed away from the pool bottom. This will add some life to the water as well!

What Are The Permanents Changes That This Substance Will Bring About?

The indigo will change the chemical composition of the water. It will alter the water’s PH level and increase the amount of oxygen dissolved in the water. As a result, the water will become more breathable.

These are all good things that you will experience after adding a small quantity of indigo to your pool. But you need to remember that this color is temporary. Once the water becomes saturated with blue, you will need to take further measures to remove it. These include washing the pool walls and replacing the water with fresh, dechlorinated water. So if you add this substance to your pool, be mindful about how you will remove it in the future!

Final Takeaway

Adding indigo to your pool’s water is a good idea, provided that you can effectively remove it when you no longer need it. While the color is rather pleasant to look at, you must remember that it’s not meant to be permanent. After adding a small quantity of the pigment, you will need to proceed with washing the pool’s wall and replacing the water with fresh, dechlorinated water. As always, proper testing and measurement should be performed before you proceed with any sort of treatment!

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