Calcium chloride is a moisture attractant, which means it will attract and hold any kind of moisture...rain, morning dew, it will even actually pull moisture out of the air...one pound of cc will absorb 14 pounds of moisture, according to Dow Chemical's product information sheets. This is not hazardous to people, it is used on dirt/gravel roads for dust, although it is much more expensive than brine, which is more commonly used for roads because of the larger quantity used. It is also environmentally friendly, since it is naturally made. It just has to be refined to pull out the impurities. I do have a spray tank and everything needed to spray available, I just wondered if going the extra with cc is worth it. Supposedly I would only have to apply it maybe twice per year, and water it down in the dryest times. I can buy it for $12 for a 50# bag.