...Does it use the typical water pan in the bottom of the unit?
If you have a choice between using city water and well water (with a lot of minerals like mine) in your incubators I recommend city water, distilled or filtered water. If you use well water chances are the water pans, float valves, etc. will end up with more build up from minerals than city water. Chlorination is a separate issue from minerals and a little
Oxine, Tek-Trol or bleach can be added if your water isn't chlorinated.
Over the years I've posted photos of many of the weird chicks that I've hatched and I think Mike and others have jokingly questioned if there is something in the water. Well...I live in the county just north of Flint, MI. Don't worry though, our Saginaw water supply isn't the same.