Followup on the previous question.

I am thinking of replacing the old standard tub with a whirlpool when
remodel the bathroom. One of the contractor who estimated the entire
remodel would cost $12000 and about $2000 extra for whirlpool tub.

However, I am concerned about my well water. The water is very hard
and the wall next to the bathtub usually turns orange in a few months
if not weeks. And the pressure is very low.

How do I improve on the pressure and the quality of the water just
enough and how much would that cost me?

Thanks
pax