Luke,
I'm with Evan on this.

"In Balance" probably isn't. Lots of folks follow "the rules" and keep chlorine between 1.5 and 3ppm while using Tri-chlor pucks or Di-Chlor powder which is raising their CYA...Once CYA hits 30, you MUST keep at least 3ppm in. When it hits 60, Chlorine cannot fall below 5ppm--and most test kits stop at 3 or 5ppm...Lots of people have CYA in the 90's or 100 and if you keep chlorine between 1.5 and 3 you COUNT on a bloom.

Once you do have algae, you must adopt our methods to kill it. Only then if it keeps coming back, do you check for phosphates.

Phosphates don't keep chlorine from killing algae--they merely are really good algae food. If the algae is dead and keeps being killed by the chlorine, the "food" phosphates won't be eaten.