Down around Krakow IIRC is a massive salt mine. However salt is ONE of the items the farmer will need: preserve food, process hides to leather, etc. Sea salt is the easiest and one of the old methods of obtaining salt which has been pointed out.
If sea water is ~2 % concentration, a liter of water ~ 1 kg would/should yield ~ 20 grams of salt. While that does not seem like a lot, with a 15 liter pot, you would get ~ 300 grams. Perhaps with just one pot, you would be getting 4 batches boiled down a day? That's giving you ~ 1.2 KG/day. Now since your by the sea anyways, you might be adding fish to the larder while you tend your salt boiling. If you use hardwood for the fire, you also are producing woodash, which is saved for making lye-- soap making, hide processing, etc. When you look at something, look outside the box.
Now if your doing the commercial boil, the same would apply only multiply by the batches...
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