In order to prevent and even help dissolving kidney stones, I read it is better to dramatically reduce salt intake (among other things). Some sites even recommend a 0-salt diet. 

While in today's modern societies salt is one of the cheapest ingredients, and many people eat too much sodium, salt is nevertheless a necessary element for the body. 

My question is related to medium sized kidney stones (~8 millimeters) that will require some time to go naturally out of the body, and salt intake:

- can the body rely on some sodium reserves during the time it takes to get rid of the intruder? (meaning no salt diet)
- or is it better to take a minimum of salt daily?