Don't forget that most of the others here love to disagree with everything I say.
So do it anyway you want to or don't do anything I suggest.
You came here in Feb 2011 asking questions as to what might be wrong with your air injection softener system. You didn't like what I had to say and have disagreed with everything I've said since then. Yet, didn't you just replace the mineral in the filter and the resin in the softener?
The problem is iron in one or both forms is getting into your softener. You need to find the cause and fix it.