White rock salt is a large crystal salt product used to grit pathways and roads and prevent ice and snow it is made by evaporating sea water and harvesting the salty crystalline deposit left behind white rock salt is best used in areas where people are more likely to walk as it leaves no brown residue that can stain carpets delivered in a bulk bag on a pallet onto a solid surface only approximately 850kg 060m3 of white rock salt is supplied