Lluvia,
I think the salt is just meant for the abrasive quality. If you have pretty hard water (which most people do). Once in a while I use some lime-away on things that have a lot of calcium or water stains. Then just normal soap and water. I don't think constantly using salt would be good for the plumbing, I don't see anybody willing to replace your plumbing based on your efforts to go green..
Here is what your city says about your water...
http://www.tempe.gov/waterquality/typical_values.htm#Hardness
Maybe one of these rocket scientists can translate.
BTW, I don't think lime-away is a "green" product, but it sure works well. Don't let the kids drink that stuff either.
Gringizzle