To answer thumperguy's question, I am only managing bronchiectasis--no MAC. I asked the pulmonologist about the 7%. Even the 3% exacerbates my coughing. His view is that as long as the 3% brings up mucus, he'd prefer to stay at that level. BTW, he saw the low setting on my Aerobika and switched it to the max--no mid-range for me! I didn't mention in my earlier post that I also nebulize Perforomist twice daily--no albuterol. I have a rescue inhaler (Atrovent) and maybe use it once daily. Perforomist is a long-acting bronchodilator. It's expensive, but Medicare Part B covers it.