Color of Pool Water


Posted onCategoriesBlue Swimming Pools, Gold Leaf Blog, Swimming Pool Water Maintenance, Updates


When it comes to above-ground and in-ground pools, there are a lot of frequently asked questions about pool maintenance. But did you know that one of the most common questions about pools is… “Why are swimming pools blue?” There are many myths regarding what turns swimming pool water blue. Let’s look at a few of these myths and get to the bottom of the pool color mystery !

Can you tell the truth from the lies?  Here are some popular myths about pool water (and one truth)…

  • Pools are painted blue at the bottom.
  • Swimming pool chemicals turn the water blue.
  • The sky makes pool water look blue.
  • Water turns light blue.

“All pools are painted blue to give them that blue look…just add water! It’s a combination of paint and pool psychology!” FALSE

Not all pools are painted blue at the bottom. The most common pool finishes include black, grays, and blue colors. However, due to developments in pool plastering, more natural and unique pool finishes have experienced a meteoric rise in popularity. In fact, some of the more popular choices today include simulated stone, glass and porcelain.

“Pool chemical turns the water blue. Pool water is dyed blue by the chemicals used to keep it healthy!” FALSE

Chlorine is added to pools to keep the water clean and clear. It is not a dyeing agent. Even though we may think a healthy pool is a blue pool when in fact a healthy pool is actually a clear pool. It’s also important to point out that salt water pools, which use salt chlorine generators are just as healthy and just as clear as those using chlorine.

“Blue skies make the pool look blue. The sky is blue and water is reflective so logically swimming pools are blue because they reflect the color of the sky.” FALSE

The blue color of the sky has little to do with the color of water. Have you ever seen a glass of water turn blue because it is outside? Are indoor pools any less blue than an outdoor pool?

Don’t give up hope! There is a reason why pool water appears blue. It’s just a matter of how… Water Turns Light Blue !

According to Dr. Paul Coxon, in a article titled Why Are Swimming Pools Usually Blue, the molecules of water absorb red light and reflect blue light. “You notice the blue effect when you have a large volume of water because of the way molecules are slightly absorbing light from the red end of the spectrum,” Coxon says. The deeper the water, the more blue it appears. He also points out that the same thing happens under artificial light.

Bringing it all Together !
What’s interesting about this swimming pool water mystery is the fact that each myth has a bit of truth. Pool finishes are often designed to enhance the blue coloring of water, chlorine keeps water clear in turn allowing the light to absorb and reflect as it should, and last but not least the sky casts light, which is absorbed and reflected by our clear swimming pool water to give it a blue look to our eyes.

Whatever the reason, nothing compares to the refreshing sensation of diving into the crystal blue water of your very own pool from Gold Leaf Pools & Landscape ! So, let us visit your backyard and see what our creative designers can do to turn your vision into reality.