The slogan "When it rains, it pours" has been associated with a brand of table salt for decades. How can salt, a solid, be poured? What unique feature at one time, but not today do you suppose was being emphasized by the slogan? In other words, under what circumstances would one brand of salt 'pour' while another brand would not and why?
I understand that a salt can be poured because they're small soild chunks but the last part stumps me. Any ideas?