The iron and manganese in your water present a challenge for a softener. The best way to treat your water would be to remove the iron/manganese first, then soften the water. If you do that you would use a 1 cubic ft softener and use about 23 lb of salt per month.

Your analysis does not include sulfur compounds (sulfates, sulfides). Since you know you have a slight odor, we should have that analysis. They will damage your softener. Sulfates in low amounts are fine, but hydrogen sulfide will damage a softener.

If you wish to remove the iron and manganese with a softener, you can only do so successfully if sulfates/sulfides are not an issue. You would need a 2.5 cubic ft softener with fine mesh resin, and use about 56 lb of salt per month. Any particulate in your well water would need to be removed prior to softening.

Installing iron removal would mean higher initial cost and an additional piece of equipment (it would look the same as a softener, but it's function would be different), but lower salt use and more reliable iron removal. Additionally, the right iron removal system will remove hydrogen sulfide as well.

Thanks alice, that is most helpful. Sorry for the delay, due to the move, I had to find the water report again. It looks like sulfate levels are 60.5 mg/l and sulfide is 1.5 ppm. With the sulfide levels where they are, I assume I need the separate systems rather than the 2.5 cubic ft system, is that correct? Is there a best system for removing the iron and sulfide (From research I am picturing a Fleck 5600 Auto Backwash Manganese Greensand Plus Filter)? Would that be sized similarly to the softener you suggested or will it need to be different? Thank you for all of your help with this. This was never something I gave even a moment's thought to until it was my own house and my own family's safety.

There are many ways of removing iron. I will list them and leave you to research. If you have more specific questions after reading up a bit I can likely help. There are a few other threads on this site about this issue as well. You can use oxidation followed by filtration, birm, greensand, Pyrolox, Terminox, Aeration followed by filtration. I tend to lean toward the Pyrolox, Terminox, or other MagOx systems as they are catalytic and don't require you to mess with chemicals.