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To raise potassium by 20 ppm in 100 L: 55.7 ml.
80 g/L x 0.4488 = 35.90 g/L K.
• Adds 1.228 ppm sulfate per ppm K; fine for occasional use, KCl preferred for routine dosing to avoid sulfate creep.
• Low solubility (~111 g/L at 20 C) - make stocks <=80-100 g/L.
• Raise K no more than ~20 ppm/day (app policy).
80 g made up to 1 L total.