Great Sinus Relief I bought this product mainly to generate steam for sinus relief. I often drop in some peppermint essential oil into the reservoir and away I go. It's simple and just works. There was just one problem I had. There was not enough steam generated when using the nasal mask. I noticed there are slits at the bottom of the nasal mask. I assume those are there for safety. I sealed that up with some duct tape and it provides solid steam every time.