Calcium chloride is corrosive, I used it 40yrs ago in flake form, easy to find then. Beginning of this season I used just non-iodized salt from Walmart, 1lb containers. When it went to single digits and below I bought a -15° melter in a bag at the local farm store. Has a combination of sodium chloride(NaCl), calcium chloride(CaCl), magnesium chloride(MgCl), and one other, might have been the rust inhibitor. The thing I don't like is that is looks more like rock salt size wise. I would mix it as needed in a separate clean bucket along with the regular salt with my dry sand/dirt mixture or just dry sand if the trap was in sand. Last two coyotes caught it was -15 to -20F. One was on a sand mound from badger digging where I had previously caught a yote. The other was in an open timber area with dirt ground, no sand.
Anybody have an idea of how to grind/pulverize this rock salt looking size stuff into something smaller? Wheat mill type grinder/ hammer mill type? Any ideas? I am going to do some waxed sand and dirt for 2018 season, but the above mixture proved itself.