After getting a Bronchiectasis diagnosis, using a nebulizer was suggested by my pulmonologist. He suggested a 3% solution. I really liked it. It was soothing, for one thing. Then, it seemed that I could no longer find a 3% solution and could only get the 7%, so have been using that, but I find it very, very harsh. It cause a lot of coughing and I feel pretty worn out after 20 min. of that. I'm not sure if it helps clear the lungs or irritates them more. I've recently stopped using the nebulizer and plan to check with my doctor later this month. I have found one supplier who supposedly still has the 3% formula, so might try that again. Still, IF the doctor says that all the coughing from the 7% is worth continuing (some people really advocate it), then I guess I will try suffering through that process, but I sure do not enjoy it at all. Good luck with your treatment plan.