mg/L == ppm
That symbol (==) means 'identically equal'. ppm are only approximately equal to mg/L and so it should not be used. For one thing, ppm implies w/w or v/v whereas mg/L is w/v. Volume changes with temperature and with the amount of material dissolved. For all intents and purposes with solutions of the strength of the waters we are describing in brewing ppm and mg/L are numerically close enough that they can be interchanged at will but an equals sign and definitely an identically equals sign should not be used. It's a nit, I know.
For all intents and purposes with solutions of the strength of the waters we are describing in brewing ppm and mg/L are numerically close enough...
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