My brother-n-law bought it new back in 1994 and never had it hooked up because the contractor took the money and ran. So I went up and hooked it up for him this year. It goes through the process of regenerating but it isn't using any salt at all. Could it be possible that the resin is hard as a rock from setting for so many years? Should it be replaced or what? Any advice or help would be greatly appreciated. thanks zack