There are many reasons for cloudy water, one of which is an impending algae bloom. With such a large difference in your FC and TC readings, and the long periods of time during which your pool wasn't getting chlorine, it looks like you're fighting something in the water. If it were my pool, I would shock the pool to 12-15 ppm and hold it at that level until there was less than a 1 ppm difference in my FC and TC numbers, and until I lose less than 1 ppm of chlorine when testing at night and again in the morning before the sun hits the pool. Keep in mind that shocking the pool doesn't mean raising the chlorine level just once--it means raising it and holding the high level until whatever you're trying to kill is gone, which can take a few days.

I would keep the filter running during the process, and brush the pool daily, preferably after chlorine additions, until it clears.


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