The algae is diffidently stirred up, I have green bubbles floating on the top of the water and the skimmer is collecting alot of algae. The algae turns white when it is killed, is that correct? Since it is still green should I add more bleach? I have been testing the water and I still have the cl up to 15ppm, (I have added bleach to keep it there). How long should it take to kill, if I don't let the numbres drop any?