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    Variable TOSNA_GRAMS_PER_GALLON_PER_PPMConst

    TOSNA_GRAMS_PER_GALLON_PER_PPM: 50

    The divisor in TOSNA's published formula, which turns a nitrogen target in ppm into grams of Fermaid-O per US gallon.

    We keep it as the single number the page prints, and don't split it into a YAN contribution per gram, because the page doesn't give one. The divisor implies a Fermaid-O YAN figure in mg/L per g/L, but TOSNA never states it, and deriving one ourselves would be an uncited coefficient, which sources.ts doesn't allow.