I am not surprised that you would be aware of the soot problems. However, many individuals may not be so well informed. Your feng shui post reminded me of this subject for which I had heard some negative issues regarding scented candles in the past but only recently came across the seriousness of the soot problem.

I too still purchase scented candles and place them in special locations to enhance the decor and enjoy the fragrance without lighting them. I started doing this when I noticed some of the fragrances gave me a headache when the candles were burned but enjoyed the scent without ever having to light them. (LOL, sometimes a headache can be a good thing.) I also have an essential oil warmer (electric, no soot) and practice, like you mention, blending different fragrances ... to enhance mood, energy, quiet moments, etc.

I love the water fountain idea and have been looking around for one. So your suggestions are much appreciated in determining just the right one ... when I find it. So thank you Coralina!