Do you know why Marine Salt is far better than traditional Brown Rock Salt? • ITS CLEANER and doesn’t leave a messy clay and grit residue, as happens with brown rock salt. • ITS MORE EFFECTIVE having a higher purity levels meaning the salt works quicker, remember it’s the salt that does the de-icing not the grit. • MORE FOR YOUR MONEY bags contain 100% salt, meaning you can clear up to twice the area compared with rock salt.