Why Don't the Seas Keep Getting Saltier?

Everyone knows that the seas are salty because, while water evaporates, the salt doesn't. But why don't our seas keep getting saltier?

Actually, they have been getting—at least over the course of millions of years—but these days, salt gets deposited on the ocean floor, so we've reached an equilibrium. This video explains why that's the case. [YouTube]

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According to legends and lore, there is a magic salt grinder that fell to the bottom of the sea*, and to this day, still continues to grind out salt.

*Because of an evil, murderous ships captain or a selfish, greedy brother, (and more) depending on your lore source.