You could try an inline bacteria filter. Google for it. It is an extra filter you can add to the hose.

It helped on my previous machine. The water chamber had nooks and crannies that were hard to keep clean and would sometimes develop an odor if I hadn't been doing a good job at cleaning it.

When I wake up in the morning, I press the on/off button, take my mask off, and place it on the night stand. Several times I have had the blue lights on the three buttons and the blue light on the humidifier control knob flash in a pattern and then the machine beeps in a continuous pattern showing a...