Ellen - The problem is delivering the enzymes specifically to the lungs - as @rits said, Arikayce is an effort to accomplish it.

Most enzymes as formulated cannot necessarily make it through the digestive and circulatory systems into the lungs. Research is underway - cystic fibrosis (CF) researchers are always working on it - with increased acknowledgement of the issue of biofilm in plumbing as a serious health issue, I hope this will accelerate.

Sue