If you make your own solution, be sure your water is safe -- that is, boil it and then let it cool. And be sure your container, maybe a neti pot? is also really clean.
@HappyHerself : Boiled cooled water is recommended, as is distilled water. I use distilled since it’s more convenient. My ENT recommends the Neilmed bottle over the neti pot since the bottle gets the saline solution into the frontal sinuses better. 4951