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To raise strontium by 1 ppm in 100 L: 3 ml.
100 g/L x 0.3286 = 32.86 g/L Sr.
• Natural seawater ~8 ppm Sr; common target 8-12 ppm. Dose only on a reliable measurement (ICP preferred; hobby Sr kits are imprecise).
• Hobby guidance suggests >15 ppm may antagonize calcification (low-confidence threshold); never exceed ~12 ppm target.
• Toxic if swallowed in quantity; keep away from children.
100 g made up to 1 L total.