I collect and use the central a/c condensate water. It's works well for me but I've seen it written of some having problems with copper in the water since it comes off the copper coils in the a/c. Can't use the water out of the tap here,,too many chemicles in it. Natural spring water would at first thought be an excellent choice but when you consider the amount of dissolved minerals in it, you can forsee the problems. Though I do know one fellow that claims he has excellent luck with it, so it's a 'try it and see' type of situation I guess.
Change the water when it or if it becomes dirty/contaminated. At some point thru the process, the rust isn't turning over to blu/black quite right leaving a hint of red in it,,time to change it of course. If you do get a mineral or dirty water streak on the tubes, try taking it off before you card them with a clean cloth wet with clean boiling water. That will alot of times remove it. You can't card it away.
