The water in your pool can change colors for multiple reasons. When it turns green the most common culprit is algae. There are other causes of green pool water that you may not have even considered, but will succeed in ruining your pool experience.
If the appropriate amount of chlorine isn’t maintained within the pool water, algae will begin to grow and the entire volume of water can transform into a green quagmire within a day. A swimming pool with an algae bloom isn’t safe to swim in and can make you ill. An additional concern is if chlorine levels aren’t maintained at the correct levels, the algae-laden water can provide an excellent breeding ground for disease-carrying insects such as mosquitoes.
Algae can also form if the power and size of your pool pump and filter are too small for the amount of water it’s cleaning. Clearing the pool of algae can take varying amounts of time, depending upon the type of filter that’s in use. It can take a week with a sand-based filter to completely clear the algae from the pool. If you have a cartridge filter, you may need to clean the cartridge every day until the pool water returns to normal.
Copper is another common cause of green pool water and can originate from a variety of sources that include cheap algaecides, from water sources, and even copper heating elements of pool heaters. It’s a problem that will get continually worse if left untreated.
The greening of pool water in this situation typically happens when a pool is shocked. If present in sufficient amounts, the metal(s) will oxidize, resulting in green pool water. Blond hair will also turn green when excessive levels of metals are present.
Pool water can also turn green or a greenish-yellow from pollen falls. The good thing about the situation is that pollen isn’t harmful or dangerous – unless you have severe allergies. Even if you don’t have plants close by the pool, pollen is easily blown about by breezes and can drift into your pool.
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