You need to determine your CYA level, then shock that pool! Keep it at shock level by testing and adding more chlorine 2-3 times daily until the water goes back to cloudy blue. Don't bother with the Ultra Bright--it's a waste of money right now. Just vac'ing the algae out won't completely get rid of it...you have to kill it first. You need chlorine, and lots of it.
Janet
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