My daughter Emily is 7 and has been doing it for a year and a half. (She was actually part of a tolerability study for her age group for hypertonic saline. She is up to a 7% solution now Anyway she has not been in the hospital in 15 months and her PFTs are up to 119%--she used to hover around 100%. I truly believe the saline is the reason for her good health--she has not had another other changes in meds.