I would go with pure quercetin instead. This bioflavonoid is antiseptic and a great bronchodilator.
I am not a big fan of Colloidal Silver
unless I make it myself. I find that many of the Colloidal Silver
products on the market are not true colloids and some have virtually no silver in them. For example some of the products out there use protein stabilizers. If you have a true silver colloid then a stabilizer is not needed. And the three 9 volt battery systems do not have enough power to make a true colloid either. Some other products I have fooled with were not photoreactive. Silver solutions should be photoreactive if there is any significant amount of silver in them. I have used Colloidal Silver
in the past I made using 600V 1 amp DC. Though I have not used it in a long time. I prefer herbs and other supplements for quite a few reasons.
As for the peroxide, that sounds like a good idea as well if there is an infection present. Keep in mind though that you need to start with food grade hydrogen peroxide, not the standard 3% store bought in the brown bottles. And it is extremely important to DILUTE the 35% before using it. One part of 35% peroxide in 11 parts of water will get you down around the same range as the 3%. Then I would dilute this still quite a bit more before using it in a nebulizer. The problem with the store bought 3% is that they use acid stabilizers in them such as sodium thiosulfate and phosphoric acid. I doubt if these would be very good for the sensitive lung tissue.