@helen1000 Please don't recommend this to others - they should consult with their own doctor before using such a large amount. The usual saline neb is one 4ml vials once or twice a day, so you are exceeding that by 2-3 times. That large amount can irritate lungs, and maybe even increase the amount of mucus lungs produce.
Have you told your docs how much/how often you are using the saline?