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What units is your meter calibrated in? 0.3 what units?
% by weight? volume?
% of a saturated salt solution?
Not sure that it will matter. I think the rest of the gunge, tyre residue, oils etc will have a more negative effect than the pure saly would have.
When I studied oceanography, years ago, we used parts per thousand, and if I remember correctly that equated roughly, and more usefully to grams of salt per litre.
As a guide fresh water is less than about 0.5 on that scale.
Brackish less than about 30, and salt water usually greater than 30 but less that 50.
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Salt Levels
Linear Mode
