Water (and most dissolved elements within) is consumed not only by drinking, but is also breathed into the lungs as droplets and is absorbed through the skin while bathing.
When operating a private well, you become your own water supplier which makes you fully responsible for the water's safety in addition to any treatment needed to improve taste, odor and aesthetics.
The appropriate treatment choice to remedy a specific problem, will often be impacted by other water conditions. A current comprehensive lab test is always recommended prior to choosing any water treatment methods since the incorrect choices can be not only less/ineffective, but also costly.