Bronchiectasis is a lung disease which causes difficulty for normal movement of mucus through our airways. Our bodies send proteins and antibodies to fight the Bronchiectasis which combine with the mucus, forming sputum which gets stuck in our airways. Mycobacteria (MAC) ,as well as other bacteria and fungus love sputum. Flutter devices like the aerobika, percussion vests and nebulized saline help us cough out the sputum.