@windwalker @margiebanks ...I am using the acapella that i bought on Amazon that comes in two pieces. The cleaning after usage is arduous. I don't use it every day cause it takes about 45 minutes of different soaks to clean it. But it definitely breaks up the gunk in the lung so I can cough it up. I was pretty surprised the first time I used it as it was that effective. The green one seems to be for people that have good airway clearance and velocity of breath.....At least that is my impression. There is also a blue one that I believe is for those that do not have as good breathing. I totally recommend it as a clearing device. The cleaning is a soak for 5 min in hot soapy water....then rinse with sterile water that has boiled for 5 minutes....then soak in hydrogen peroxide for 30 minutes....then rinse again in sterile water that has boiled for 5 minutes. Yikes!! Ok...Just checked the literature that came with it///The Green is for patients able to maintain an expiratory flow of 15 liters per minute or greater for 3 seconds. The blue is recommended for patients capable of less than 15 liters per minute for 3 seconds. It has an adjustment on it to make it stronger or less vibratory. It says to start at the lowest level. Hope this helps...Margie...you are like me..I want everything I can get my hands on that will improve the condition. (Exception is flu shots that I really question ....I still believe they weaken the immune system....Guess I am just an old hippie at heart...haha) Kate