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You can't "filter" dissolved salt from seawater. Either the description you found is dumbed down for the masses, or just plain wrong. It is possible to separate seawater into concentrated brine a...
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#1: Attribution notice removed
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System
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2020-06-03T15:54:27Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/20637 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/