I have city water, and also a water softener because the water here is terribly hard. So I replaced my water heater myself not too long ago and in the process I noticed that my kitchen sink and ice machine both have their cold water supplies coming off the "Hard" water pipe which is running the the outside hose bib. I had noticed in the past that the kitchen sink gets scale buildup around the faucet and also the ice seems to have a lot of deposits in it. I traced the lines and found all the other cold water pipes in the house are "Soft" water. Any reason for this? Or just idiot plumbers? I would like to fix it, but thought maybe there was some reason for this.