It's a device that uses oscillating air pressure to try to loosen mucus to make it easier to cough up and out. It's similar to an Aerobika or an acapella. They all do the same thing.

I use an Acapella, on setting 4, at least 4 times a day... usually 30 minutes or so after taking 400-600 mg of Guafenasin... and drinking lots of water! I also try to do my corticosteroid inhalers about 30-60 minutes after any lung clearance post Acapella use. Also, be sure on your inhaler usage, if any, that you force all the stale air out with a deep expiry exhalation before sucking in, and holding as long as possible, your medication. It works for me!
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Non medical suppose to loos3n phelm and strengthen lungs. Good for more info!

never heard of it? What is it?