I dont have much experience with kidney problems myself, but my mother had for many years
(kidney cysts, stones, PAIN)
-she avoided salt at all costs, had numerous cleanses, herbs etc. Was very ill to the point we thought we would lose her.
Better when introducing good salt and iodine; she went the slow route, so it took about 1 1/2 years before she was cured, well 90 % or so.