I don't think it's worth it doing that. Your body needs salt and there is no way you can last a long time without salt in your diet (you will become extremely weak).
hey! I am actually on a different kind of salt just for my face. It dosent have Iodine which causes breakouts. I got mine at Kroger's for 89 cents! It says "This product does not contain Iodine" So I have only been using it for a few days so I will have to see hoe it works! (I think it tastes better then regular salt too!)
Yeah, salt-free doesn't sound too good. However, you can modify your salt intake by trying to minimize the iodine consumed. Iodine is thought to cause acne so I avoid it in my multi-vitamin and in my salt at home. Instead I buy Sea Salt from the health food store and have not had any problems. I believe there are also iodine-free options at the regular grocery store as well.