Here's a quick overview of how an Iron Curtain filter system works:
The Iron Curtain unit contains a unique, two tank system. It uses a “media bed,” like a water softener, but in this case, the media is not resin but multi-layer bed of minerals that removes iron, rust, colors and odors from your water. When water passes through the gradient of minerals in the tank the Iron Curtain filter captures the iron precipitate, leaving the water iron-free. The system even regularly maintains itself with periodic back-washing to remove the precipitated iron and, less frequently, regenerating to refresh the oxidizing ability of the media bed.