Salt water to prevent freezing in a fountain outdoors during winter?

I have a small faux waterfall I bought at Home depot, and I would like to use it during the winter outdoors. I know ordinarily in Denver water freezes during the winter, but I thought maybe adding salt to the water would prevent this. It would be either regular table salt, or perhaps mag chloride, or another salt for frozen walkways. I don't want to use antifreeze, as it is incredibly toxic, even the so called "environmentally safe" ones. I also fear antifreeze could evaporate. My main question is, are regular pumps able to handle salt water or would they break? The shape of the waterfall I believe is fibergl, so it should be fine.