With a CYA of 90, you're not getting the chlorine high enough to kill off the bloom. YOu need to shock it to 20 and hold it there until it clears, which will take re-testing and adding more bleach to get back up to 20, at least 2-3 times daily. Keep the filter running 24/7 and brush it daily while doing this. It'll clear up--you're just not getting high enough with the Cl to compensate for the high CYA.
Janet
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