Vehicles from Ontario were always known for extreme rusting issues because they used more salt. I found the info below from the City of Edmonton. The calcium chloride brine by itself was horrible and I think mixing it with the sand is a relatively new process. The sand with rock chips works the best. I've heard it can be reused 3 times before the chips are too rounded to help much. What is very evident is they don't put nearly as much sand down as they used to. They are always complaining they are over budget for snow and ice removal.
They waste money on stupid stuff and the work that needs done is neglected. They used to cut the grass along road sides, freeways and empty lots. Now they planted a bunch of tree's along freeways trying to make it look better but the grass isn't cut so the tree's defeat the purpose. They used a zillion paving stones along the Whitemud Freeway and what a waste of money. They're buckling, lifting up, missing and have weeds growing in-between them. Looks like crap. The city overall looks very unkept to what it used to be.
"The sand mix is a mixture of sand, salt, rock chips (which are being phased out of the mix) and calcium chloride brine. The City follows a matrix for determining the specific ratios of sand, salt and chip required to combat icy or snowy conditions depending on the conditions. Edmonton is one of the lowest salt users of Canada’s major cities - salt accounts for only 12 to 18% of the materials applied to the roads annually."