@beatrixflower I started with .09%, I think that’s pretty much the %of sodium in our tears and what the Dr will first prescribe. I then went to 3% and eventually to 7%. The 7% can be very irritating at first, so I would suggest a gradual change if you decide. The .09 will help loosen some of the mucus in your lungs to help with clearance but I don’t think it makes the lungs “inhospitable” to any NTM.