Regarding saline solution to irrigate the sinuses (e.g., to be used in a neti pot): is it really necessary to use salt that does not contain iodine? Recipes all over the internet say to use non-iodized table salt, and I don’t understand why. I prefer to make my own solutions; why waste money buying salt water? The salt in my diet has iodine in it, so the membranes in my digestive tract are exposed to it every day. Why do I need to protect my nasal membranes from it? I use it twice a week at most, if that’s pertinent.