[sandworm101]

Humidity theoretically doesn't contain salt, but air does. Any technology that is harvesting moisture from air will involve large amounts of air. That air contains dust and sea salt which can contaminate the process. Setup a moisture farm to harvest sea breezes and you will have to address a salt problem.

In many industries this airborne salt can cause corrosion. Talk to anyone with a classic car in LA/SF, both cities with sea breezes. They don't want to leave them outside too much. That's why the aircraft "boneyards" are all in the interior, across the mountains from the sea.