How can I improve the health of my kidneys?

the full proof way to find out if your kidneys are functioning properly is to go have some bloodwork done!! my husband has kidney failure and he does not have these deposits you speak of. and if your kidneys are failing then lay off the sodium, potium, phosphurous(dairy products)and lay off on the liquids, yep even water. my hubby can only have 30 ounces of fluid per day!! once your kidneys fail there is no bringing them back you can just try to save what is left of them