Free delivery hallstone brown de icing rock salt without messy grit or sand our de icing salt is natural brown rock salt which will naturally disperse over time unlike some salt substitutes it contains only a very small amount of anti caking agent to allow prolonged storage our rock salt complies with british standard bs32472011 and is approximately 6mm in size ideal for use in manual and mechanical spreaders for roads and paths cost saving idea why not split the cost and share a pal