Yes. She is quite a proponent of 7% - she works with the docs at Mayo and UT Tyler in Texas - they all feels it tamps down MAC. She has been at this for 20 years and says that saline plus daily airway clearance has been a real game changer. She doesn't even want me to neb levalbuterol or budoesnide before - says my Symbicort inhaler is enough.
Here is a personal observation that led me to reducing frequency -when I went to once a day 2 years ago, the day after, when I did airway clearance, I could clearly "taste" the salt in my sputum - which led me to believe it stays there for a while.