Hi Kathleen, Thank you for your post. I have been using 7% saline which I took upon myself to purchase from Amazon, thanks to a kind soul sharing this info with our group. I really feel it is helping me a lot. I nebulize with the Aerobika 2x per day and then do 20 minutes with my Hillrom compression vest. Every time I neb, I cough up a good amount of mucus. I am now able to sleep through the night with very little coughing. I can see a marked difference since using the 7%. Good luck to you as well!