Thanks to everyone who responded to my post!

I suspect that the iron is coming from my fill water. Our pool was a very nasty color when we first added water. And I'm sure that high pH is involved since it keeps creeping up on me.

One last question (well maybe 2)...

Waterbear~ You mentioned that my water may turn cloudy when I add the sequesterent...How long will this last and will I have to treat the water for the cloudiness or will it clear up on its own?