Matthias.  A properly ...

Matthias.  A properly developed and sealed well, that is not under the direct influence of surface water, should not require filtration or disinfection, but a professional engineer can advise you further on this.  Obtaining a representative water sample and a potable water analysis from and accredited laboratory is your next step.  Note that samples for dissolved metals must be filtered and acidified when the sample is collected.  The lab will provide you with a syringe and filter if requested, along with prepared sample bottles for each test parameter.  As you are aware the water his a high iron concentration, you may have already had a water sample analyzed; however, even to determine the most sustainable method of treating iron (if necessary) you need to know the total iron and dissolved iron, and that requires proper sampling.  As noted in other comments, iron is not typically a health issue but can cause staining if too high, and can also result in your well becoming clogged with iron bacteria.  This is not a water quality problem, and can be managed through well maintenance and periodic treatment with chlorine bleach.  Until you obtain a proper water sample analysis, you will not obtain useful advice on treatment, and will just become confused.  The best passive water treatment advice I can give is to hire a local professional engineer with water treatment expertise.  Once he/she has determined what needs treating, then seek the experience and knowledge of others to identify novel and tested treatment alternatives.