Thanks so much for your replies, Waterbear & Dave! I really appreciate your help.
I had not considered iron...
But where is it coming from??? We are on municipal water and Baton Rouge's water is notoriously SOFT (aggravatingly so!).
Also, I am not a scientist (my degree is in history ) but why wouldn't Metal Out remove iron from the water?
Finally, I know NOTHING about using ascorbic acid... do I need to stop the chlorine (I use a feeder with the discs) and do I need to let the chlorine level drop before adding the asc. acid?
I'm sorry to be such a novice; this is all still very new to me!
Thanks again,