Hypertonic saline will suppress mycobacteria, meaning it cannot grow. I am on the road with no access to my usual materials, but there is a research paper showing the effect of different concentrations of saline on various strains - most cannot survive at 6% or higher.
The second effect is thinning of mucus, which aids in lung clearance.
I stopped antibiotics while still MAC positive due to side effects. I have stayed healthy for 30 months using 7% saline, airway clearance and asthma meds as needed. I have had 2 minor exacerbation, treated with steroids and a short course of antibiotics.
This was through Covid and regular interaction with 2 little germ factories (aka grandsons) , as well as traveling and continuing many activities. Many others on Connect have had similar experience.
Sue