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To raise iron by 1 ppb in 100 L: 0.044 ml.
10 g/L x 0.2280 = 2280 mg/L Fe (scale by label %Fe / 22.8%).
• Same iron cautions as ferrous gluconate (algae fuel; small frequent doses).
• Ferric ammonium citrate contributes ammonium; avoid in nutrient-sensitive tanks or account for it.
• RHF has described making iron citrate from iron(II) sulfate + sodium citrate; that route also adds sulfate/sodium.
10 g made up to 1 L total.