I use arobika while nebbing and no coughing using 7% twice daily. I was not finishing all the Sod. Chl. in 15-20 mins and not understanding why. I sterilize everything after each use. Can something happen to the arobika that keeps the medicine from going into the lungs? I tried using regular and other type neb kits without the aerobika and I would cough and actually coughed up mostly light yellow sputum. I'm on my third aerobika in 2 years but I thought they would last longer as I do soap/water cleaning and sterilizing in microwave bags. I am asymptomatic and want to stay that way. Any thoughts?