Thanks for the advice, Lizistired. I've been too scared to experiment with the pressure settings on my machine, but I've had it for almost a year now, so I should figure out how to use it. I'll set it to max pressure and (hopefully) blast everything out.

I was diagnosed with sleep apnea in August of 2011. Since then, I've been fairly compliant in using my Philips Respironics Remstar Auto with A-Flex. I had some trouble over the winter keeping the humidity sufficiently high, but that's no longer a problem now that it's summer here (near Chicago). Lat...