Hi Garry, did you get 9% or .9%? Tricky little decimal point! Point 9% is the normal amount of saline we have in our bodies and won't do much as far as causing your lungs to cough up sputum. 7% has seven times as much saline and comes in 4ml vials. I thought that 7% requires a prescription but someone recently said that you can get it in Amazon without a prescription.

The sputum sample will show if the antibiotics you are taking are working to kill your particular lung bacteria. They don't work for everybody and when they do work it some times takes a while before there is progress.