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To raise iodine by 0.02 ppm in 100 L: 2.6 ml.
1 g KI to 1 L -> 764.5 mg/L I; 1 ml in 100 L adds 7.64 ug/L (ppb).
• Natural seawater total iodine ~60 ug/L (0.06 ppm). 1 g KI in 100 L adds ~7,600 ug/L - more than 100x natural; ALWAYS use a dilute stock.
• Dose small daily/weekly amounts based on an iodine test; many reefers do fine without iodine dosing.
• Overdose can harm corals and invertebrates; never bolus.
1 g made up to 1 L total.