Kosher salt dissolves into a brine as it melts ice ... Luckily, there are other options to melt it quickly. Magnesium sulfate heptahydrate, the chemical compound in Epsom salt, will melt ice.

Background: Antenatal magnesium sulphate, widely used in obstetrics to improve maternal and infant outcomes, may be associated with adverse effects for the mother sufficient for treatment cessation.