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I made up a 1 liter calibration solution according to the recipe by Randy Holmes-Farley on his Reef Alchemy site. 2104 g RO/DI water plus 1/4 cup + 1 tsp of salt, for a salinity of 35. This solution gave a much different refractometer result (higher) than using 1 tsp + 161 ml. This makes sense because the smaller a recipe is broken down, the more error that is introduced.
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