I have been using the water from my basement dehumidifier for over a year now on my current terrarium. I have not had any ill effects. During my 4H years, I had a terrarium and used the water from my parents dehumidifier. When I was a student at the Ohio State University's Agricultural Institute, my professor and I used the water from the condensing coils of the greenhouse refigerators. This included watering of VFTs, Pitcher Plants, Sundews, and Butterwarts. The year before I graduated from ATI, we even used the water on a new Nepenthes.
My 2 cents. *[img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img]