Filtering clear water iron as opposed particulate iron requires special filters.
Here are three sites with info:
Cartridges
ONEHousings and Specialty Cartridges
TWOSpecialty cartridges (iron removal)
THREE The cartridges also remove manganese, and some sulfur compounds.
The housings can be fitted with hose connectors so they can be put between the tap and your fresh water hose.
We were volunteers at a state park in ID and the iron content in the water was horrendous.
After we left it half a day to remove the stains on the sinks,shower,
and toilet.
I used Iron Out which worked better than anything else I tried. The rangers furnished it to us while we were at the park.
However the fumes were so irritating that I borrowed my sister in law's haz mat mask she used when she was spraying her orchard so I could do the job.