I suspect it may have something to do with the tap water. As an experiment why not flush with distilled water (available at grocery markets) for a while and see if it goes away? Mine doesn't do that and I am using RO water with MSU.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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