My thinking is that if the condensate doesn't test like distilled water, then there must be contamination coming from somewhere. Crud in the dehumidifier would be the first place I'd look, but it's also possible there may be something from the air, because other volatile substances are possible contaminants. I'm not sure what that might be, though.
I like the idea of aerating the feed water--a lot. Aeration is a common method of treating waste water, but I doubt that's much of a concern. It certainly would oxygenate the water, though. I'm currently using tap water and let the water sit for several days before using it to let the chlorine dissipate. Aeration would make that happen faster, so I may try aeration after I resolve some of my other, more pressing problems.
Speaking of more pressing problems, I'm ready to order the
AC Infinity S6 fan. The 69 WiFi controller is supposed to be available today, but I haven't checked yet. I'm thinking I can run the fan with the basic controller till I can get the one I want. I chatted with a representative from the company and she agreed that's the best way to do it.