Good link for iron removal lots of snake oil sales in home water treatment, so be wary.
Usually area-specific iron problems, your local water treatment operators at your local city's are a good resource for information, and know which treatment system works. A good lab can test your water and from that, you can decide what system works best by test results. I would use an independent lab, not one that is trying to sell you a water treatment system.
http://wellwaterguide.net/iron-well-water.aspx
