This is the appropriate technology. That air injection is upstream of a manganese oxide media bed. The air injection (or chlorine) oxidizes the dissolved iron so that the manganese oxide media can filter it out. The media will usually oxidize it by itself except in rare cases but the air injection or chlorine really improve efficiency.
I use a non air injection manganese oxide filter at home to remove iron. It's been in service for about 10 years now with just some o-ring replacement in the backwashing filter head.
Water softeners are only dependably good for up to 2 ppm of iron. Save them for softening water, get an iron filter for removing iron.
You have a ton of iron! Almost certainly so much that you will need to oxidize it first with chlorine. The EPA calls out 0.3 ppm as the upper limit before you will have problems with staining.
Give these guys a call. Fortunately, you know the iron concentration you're dealing with.
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