Seawater under microscope.
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Previously:
https://www.homemadetools.net/forum/...210#post188264
https://www.homemadetools.net/forum/...990#post179782
https://www.homemadetools.net/forum/...298#post161591
https://www.homemadetools.net/forum/...291#post150307
https://www.homemadetools.net/forum/...346#post192507
