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Exactly. It's been around for billion(s?) of years having rain water dissolve land and run into it. Shouldn't it be as salty as it can be?

Perhaps it's deep sea flour shenanigans keeping it at some stable level.

These gluten-free artisinal flours are getting out of hand.

Well, there are also salt mines where we get the salt for eating and putting on the road from. They are dried up sea bed.

So whatever process produces the mineable deposits will necessarily remove salt from the wider oceans.