My pulmonologist put me on 3% saline after diagnosis. After 3 years nebulizing and reading on this site that 7% was better I switched. I found that 7% works far better in the AM but if I use 7% in the evening coughing interfered with my sleep. So now I use 7% in the morning and 3% around 5 PM. When I shared this with my pulmonologist he didn’t know about 7% but said he had no problem ordering it. Medicare and most insurance companies do not cover saline as there is no meds in it.