You're going to have to take the chlorine much higher to kill the algae with a cya reading of 100. For now, aim to keep the chlorine level at 20. Test at least twice, and 3 times a day is better if you can do it and each time, add enough bleach to take the cl back to 20. The key to killing algae is to sustain the high cl reading instead of letting it yo-yo up and down. (If that doesn't clear it, we may suggest taking it to 25. See the chart at the following link.)

http://www.poolforum.com/pf2/showthread.php?t=365



Regarding the eyeball - typically, if I need to skim the debris off the surface, I aim it upward. Otherwise, I think it circulates the water better if you aim it downward. For now, aim it downward. Also, run your pump 24/7 while you are trying to clear the water.

What are your other readings?