@danny5 I also have sleep apnea with a deviated septum. I had the humidity tank with my previous 2 CPAPs that I no longer have due to the recall - Dreamstation and Dreamstation Go portable CPAP. I stopped using the humidifier tank for the same reason. It seemed to make my congestion worse. I did like the heated hose which I no longer have because my bedroom gets a little cold in the winter and it effects the air I breathe more than my body.

I decided against surgery to fix the deviated septum after a long talk with my Mayo ENT doctor. He put me on a 3 month Rx of a proprietary nasal spray that I did in the morning and the evening which helped clear up my nose. He said my problem was caused by chronic rhinitis. After the Rx ran out I was able to treat the rhinitis with a twice daily saline nasal rinse for a little over a year. Then I saw an ad on the SinuSonic and decided to give it a try. They last about 6 months before you have to replace it which was almost as cheap as 6 months of daily nasal rinse supplies and it actually does help keep my nasal passages clear if I use it one or two times daily. Another plus for me is that it's much easier to do than the nasal rinse.

I think it probably does need a larger study. This was the first study (small) that I looked at which convinced me to give it a try.
-- A novel device combining acoustic vibration with oscillating expiratory pressure for the treatment of nasal congestion: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317541/