Water that was crystal clear suddenly turns green or cloudy in the middle of summer. Here are the real causes and how to restore clarity to the pool quickly.
One of the most common summer problems: a pool that was perfectly clear last week suddenly turns a dull green or uncomfortably cloudy color. High heat speeds up certain chemical and biological processes in the water, and understanding them makes the fix much faster than random trial and error.
High summer temperatures significantly speed up algae growth in water compared to other months. Even a chlorine level that was sufficient in winter may not be enough at the peak of summer to counter the accelerated algae growth rate, gradually turning the water green if the treatment dose isn't raised.
Cloudy (not green) water is often not caused by algae, but by a pH imbalance or a weak filtration system. High summer heat increases the water evaporation rate, which shifts chemical concentration faster than happens in colder months.
Increasing chlorine without addressing the root cause (chemical imbalance or weak filtration) may mask the problem temporarily, but it comes back quickly. The real fix starts with carefully testing chlorine, pH, and alkalinity levels together, not randomly increasing one quantity.
Because of high heat and increased pool use in summer, water balance testing needs to happen more often — at least weekly instead of every two weeks as in colder seasons — with more frequent filter cleaning to keep up with the extra load.
Can you swim in a pool that has turned green?
It's not recommended until the water is treated and rebalanced, since algae growth is often accompanied by reduced effectiveness of disinfection against bacteria.
How long does it take to clear the water after it turns green?
It depends on the severity of the problem, but proper treatment usually shows clear improvement within 24 to 48 hours.
Does pool cleaning include checking the filtration system or just the water?
Effective treatment covers both together — chemically balanced water along with an efficiently working filtration system, since a fault in either brings the problem back quickly.
The NadafhPro team is ready to handle any of these problems directly — reach out on WhatsApp for a quick assessment of your situation.
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