More often... folks with WCD systems simply make their WC water slightly less saline to (over)compensate for the diff... unlike a meter (hobby grade salinity meters have been historically unreliable/inaccurate), the adjusted SG water is at least reliable (cannot fail) and is simple enough.
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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