The best replacement for rock salt is calcium chloride.

The best alternatives to rock salt are rated as following:
★★★★★  calcium chloride
★★★★  table salt
★★★★  sea salt
★★★★  ice melt
★★★  kosher salt
★  solar salt
★  iodized salt
★  sand
★  salt
★  ice cream salt
★  calcium
★  rock gypsum
★  halite
★  softener salt
  pellets
  himalayan salt
  magnesium chloride
  epsom salt
  kitty litter
  regular salt
  pool salt
  sodium chloride
  black salt
  liquid calcium chloride
  grit
  water softener salt
  salt pellets
  coarse salt
  canning salt
  pond salt
  kosher sale

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Google Trends

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rock salt
calcium chloride
table salt