Hi, and welcome!! Odds are that the bloom went in slow motion because you had enough chlorine to slow it down but not stop it. You need to shock the pool up to 15 ppm and keep it there by testing and adding more chlorine as often as possible, filter running 24/7, brushing the pool daily. The pool willcleqr if you keep the chlorine up. I can assure you the cloudiness was NOT due to low calcium.
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