Twice a day to keep the bugs away! Or at least lower their numbers. Other airway clearance options include acapella/aerobika, huff coughing, positional drainage, and active cycle breathing. For non-mild BE cases it's probably a good idea to say aggressive with airway clearance, in my opinion, a non-medical person. My docs have recently started using the word severe when referring to the BE and cavitary MAC, so I'm doing everything I can think of to prevent further damage. Peace and blessings to all.