Q:

Why causes swimming pool water to be cloudy?

A:

Quick Answer

Cloudy pool water is the result of either a mechanical issue or a chemical imbalance. The most common cause of cloudy pool water is a chemical one, but before altering the water balance, pool owners should check their filtration system.

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Full Answer

If the filter is in good working order, users should make sure they are running their filter long enough and frequently enough and that their filter system can sufficiently cater to the size of the pool. Otherwise, particles, impurities and algae can build up in the water, turning it cloudy.

Once mechanical issues have been ruled out, the cloudy water problem is the result of a chemical issue. The most common chemical cause of cloudy pool water is inadequate chlorination, which allows algae to grow in the water, turning it cloudy. If the pH of the pool water is too high, it slows the reaction rate and efficiency of the chlorine.

Even though users may be adding the recommended dose of chlorine to their water, with slower reaction times and less efficacy, the chlorine cannot effectively kill all the algae, resulting in cloudy water. The same occurs if the alkalinity of the water is too high. Cloudy pool water can also occur when the calcium hardness of the pool water exceeds 400ppm and the water temperature hits 85 degrees Fahrenheit or above.

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