@Imh7 @jasmine321 @windwalker ...Oooops! Not sure if I am posting/responding to imh7 or jasmine...Jasmine...I apologize for not replying to you. I think we are all in the same discussion. Although I have not been nebulizing long, I too have found that I have gone from green/yellow gunk fairly often to mostly a clear color now when I cough up my phlegm, sometimes with just tiny specks of green. I take that as a very good sign. I have not gotten mine yet, as my medical supply shop is out of them, but I will be ordering the acapella online. Looks like they are running $35-40. ...It is called an Acapella flutter valve or Acapella Pep Device. I believe the green is for those with good air velocity. Terri... Do you know if that is right? Terri... Is that the clearance device you use or is yours an aerobika? .Also, Would there be any reason not to try this as opposed to a $3,400 vest? I don't think a lot of us have 3,400. to invest in a vest... Jasmine...can you call your Dr and ask which airway clearance device you could use that is affordable?