Jeff, we also boil nebs daily. DS nebs albuterol/atrovent 3 times a day, tobi twice and pulmozyme once, so we have enough neb cups that I can boil them over my noon hour. We don't want to run the risk of bacteria or anything growing in the neb cups and getting into DS' lungs. And it's amazing in a humid climate how quickly mold can grow on those things. Had some we travelled with, used in the morning, set aside then put in a baggy to take home with us to sterilize and the next day there was mold on them.