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• DO NOT recommend routine barium dosing. Soluble barium salts are acutely toxic to people (gram-level ingestion can be fatal); handle with gloves, label clearly, keep from children/pets.
• Natural seawater Ba is only ~5-20 ug/L; 1 g in 100 L would add ~5,600 ug/L. Barium precipitates with sulfate (BaSO4), so tank levels are self-limiting and ICP 'low Ba' often does not justify dosing.
• Only with ICP evidence of depletion, via a dilute stock, small increments, re-test.
pH effect: neutral.