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To raise barium by 2 ppb in 100 L: 0.4 ml.
Maker’s daily maximum: 2 ml per 100 L (2 ml for 100 L).
Lab line: dose from ICP-OES results toward 0.001-0.04 ppm. Max 2 ml per 100 L per day; split larger corrections over days.
aquaforest.eu/en/products/lab/microelements/barium/