@irenea8, I use the NEIL MED whale (Neil Med squeezie, on Amazon). I fill it up to the line with boiled distilled water, add a packet or 2 of Neil Med salt and once a day I empty a capsule of Budesonide in it (compounded med prescribed by my ENT). My ENT just recommended adding 2.5 ml of a J&J baby shampoo, as it is supposed to inhibit the formation of bacteria film. In my experience, the sinus lavage considerably reduced my sputum production.
Best wishes of great health to all of us!