An ice cube does melt much faster in tap water than in salt water. But salt water is much denser than tap water, warm or cold, because of the salt in it. Hence ice will melt faster with the addition of sea salt. read more
Well, it doesn't, unless there is a little water available with the ice. The good news is you don't need a pool of water to achieve the effect. Ice typically is coated with a thin film of liquid water, which is all it takes. read more
Most people prefer rock salt to melt ice (sidewalks, driveways, etc) over table salt because it does not cake on the surface like table salt. read more