If you're going from green to cloudy blue, that is great progress...keep the chlorine at 15 and keep your filter running....the cloudiness is dead algae that the filter will have to eliminate.
I would not put any more copper-based algaecide in the pool...once the copper gets to a certain level, if you don't keep the pH and alk low, it will start staining your pool, and from there pool care gets quit a bit more difficult. CarlD is right--at that point, Marie is the one who will need to help you since she's our resident expert at staining.
Janet
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