Sea salt may not be used, as it is too fine and dissolves too quickly, so all salt used in gritting comes from salt mines, a non-renewable source.
噴灑車不能使用海鹽，因為它粉末太細、溶解太快，因此，所有噴灑使用的鹽都來自鹽礦，也就是一種非可再生資源。