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To raise fluoride by 0.1 ppm in 100 L: 10 ml.
2.210 g NaF (= 1.000/0.4525) to 1 L -> 1,000 mg/L F; 1 ml in 100 L = 0.010 ppm; 100 ml raises 100 L by 1 ppm. Matches the R2R-quoted 2.21 g/L recipe.
• Natural seawater ~1.3 ppm F; targets 1.2-1.5 ppm. Pause dosing above ~1.6 ppm.
• 1 g in 100 L adds ~4.5 ppm F (3.5x natural) - always via stock solution and test-driven.
• Fluoride can precipitate with calcium (CaF2) at elevated levels; small increments only.
• Potassium fluoride (KF) is an alternative with similar toxicity (F fraction 0.327).
2.21 g made up to 1 L total.
reef2reef.com/threads/post-your-diy-additives-here.344149/post-12941581