I have a CPAP, too! I found mine stunk at first and with no water in the water container. Of course, I've head it a year now and it seems to be working okay. No stink. If there is, I don't notice it anymore.I came back Tues from more testing at methodist. I never used my cpap til I got home. I tried it at night and it stunk aweful and sounded bad. They had put water in the chamber so then the tubing was also full of water. Somehow I have to clean and empty it. I think I'm going to pay $35 for a whole new set instead.