How do you deal with very hard well water? Do any of you have very hard well water - what do you do? Do you buy one of those units you attach to the faucet? Our water smells like metal and where the water dripped into the SS sink while we were gone, it is brown...sort of rusty looking. Before we went to AZ, we got water from MIL in plastic jugs....is there anything you can do to soften water --- and if you use a filter, which one do you recommend?