Should work still with less irritation. Especially if you do not have a heavy load of mucus or infection going on. 7 is better but sounds like you need to give your mouth a break and at least see if less saline helps.

We’ve both been to NJH who are the experts when it comes to MAC. I was using 7% early in the day and 3% for the second one. I was told specifically to use 7% for both. Have you tried rinsing your mouth immediately after using saline? I know I cough up more mucous when using 7%.

3% was the saline I was originally prescribed, but since the pandemic it has apparently been reserved only for hospital patients. My doc approved switching to 7%. I have no problem with it, but just wanted to say that 3% is what my pulmonologist wanted me to use from the start.