Something like 60 ppm iron or do you know how much iron and what the actual hardness is. In other words do you have credible water test results? And then how did you decide that a 1.5 cu/ft softener was the right size and for that matter how did you come up with the size for your birm filter? And, which is first in line, the birm filter or the softener?
So what are the water conditions
How many people in the house IE what is your average daily usage.