Bobert,
We, out here in Arizony land have always had hard water, then the developers overbuilt for the area and we started getting Colorado River water (C.A.P. central Arizona Project water) which is the most vile tasting stuff you could ever imagine. blew everyone's plumbing to bits! (really!) anyway we tried reverse osmosis and thismis and thatsmis, finally we found KINETICO Systems you can use rock salt but we use potassium pellets instead (easier on the personal plumbin') and that seems too have fixed the problem. We were changing every faucet in the house about every 1 to 1&1/2 years we installed the system 4 years ago now and not a single problem since. I hope this helps.
~Biskit~