While light green mucus can sometimes indicate an infection, it's not a definitive sign. For people with bronchiectasis, it's pretty common to have some colored mucus even without an active infection. The key is to pay attention to any other changes, like an increase in how much you're coughing up, a change in consistency, or feeling more tired and run-down.

Regarding the saline solution, if your doctor suggested trying the 7% and you're curious, it might be worth giving it a shot. Since they said there's no urgency, it sounds like it's more about what works best for you. Some people find that stronger saline helps them clear out more mucus, which can be a good thing.

Just one question, what is the name of the new drug you are talking about?