@bolso1 It's good for both bronchiectasis and MAC. Please see table 2 in this paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4850692/

Bolso, Excellent article. I understand it to say Hypertonic saline may not kill the NTM but certainly keep it under control which is a wonderful thing for patients who can not tolerate the antibiotics. But only good in certain situations.
To quote the authors "Since hypertonic saline (HS) inhalation is safe and has shown a clinical effect in bronchiectasis patients we have included HS inhalation in our local NTM treatment protocol. In clinical practice, we advise patients with nodular-bronchiectatic disease to start with HS inhalation two times daily as the only therapy for the first 3 months. When patients tolerate HS and when there are no clinical signs of disease deterioration, we continue HS as the only treatment with close observation of possible disease progression"
I have been using 7% saline for about a year now with excellent results. It is a part of my daily airway clearance. A big thanks to all the members here who have promoted this therapy.
I believe that while the NTM/MAC is being kept under control by the HS, the body's immune system may kick in and actually kill the bacteria, a good reason to have a healthy lifestyle. Just my opinion, I can not cite any studies.