Cloudy water is often one of the most common problems when dealing with swimming pool water. There are many things that can prevent you from having crystal-clear water. Your pool sand filter is often one of the causes, and it can be remedied with some time and patience. Keeping your pool water clear takes a lot of work and daily maintenance. It is a must if you want to extend the life of your swimming season.
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Open the top of the sand filter and examine the inside. Look to see if the sand still reaches the required level and appears clean and white.
Add sand to bring the level where it should be. Low levels of sand can prevent the water from being filtered properly. Change the sand at least once a season.
Replace the lid on the filter and turn the lever to "Backwash." Turn the pump on and allow the filter to run for at least two minutes to clean the sand. Leave the water on if the water is not running clear. Turn the filter off and turn the lever back to "Filter."
Run your filter all day, every day or until the cloudy water has cleared up. Check the pH of your pool if the water does not clear up in a few days.