Pool Water Colors

A clean pool prevents dirty and murky water.
A clean pool prevents dirty and murky water. (Image: Jupiterimages/Creatas/Getty Images)

A pool is expected to look clear, clean and blue, but this is not always the case. Sometimes pool water is murky or an unexpected color, which is usually a cause for concern, signaling a disruption in water chemical ratios or algae. The color of pool plaster also affects the pool water color.

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Green or Brown Pool Water

Green, brown or green-brown pool water signals an algae infestation or large amounts of dust, dirt, sand and other contaminates. The pH level must be checked and adjusted to a pH of 7.2 to 7.4. Ridding a pool of algae is a process that involves super-chlorination, or shocking, vacuuming and scrubbing the pool.

Black Pool Water

Most likely an indication of the presence of black algae, black pool water can be difficult to remove. The pool must be treated for algae. Always follow all of the manufacturer’s instructions when adding pool shock to the water or when using any algaecide products. Adjust the pH levels if needed.

Yellow Pool Water

Yellow pool water signifies mustard algae, which can also be difficult to treat. Follow a strict cleansing regimen and treat the pool for algae. Clean the pool well and shock it as instructions entail. Monitor the pH levels of the water and adjust them as needed.

Gray Pool Water

Cloudy, gray pool water usually means there is high alkalinity. Lower the total alkalinity to 80 to 120 ppm and check the filter, making certain it is functioning properly.

Pool Plaster Color

The color of pool plaster changes water color. White plaster creates a clean-looking pool while light blue plaster gives the water a clean blue look. A greenish-blue gives the look of natural, clean pond or river water and a dark blue creates the look of natural lake water. Some plasters contain sparkles to make the water look like it is sparkling. Hire a professional to show you exactly how different colors will look once a pool is full of water.


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