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To raise lithium by 20 ppb in 100 L: 2 ml.
Maker’s daily maximum: 4 ml per 100 L (4 ml for 100 L).
Lab line: dose from ICP-OES results toward 0.15-0.20 ppm. Max 4 ml per 100 L per day; split larger corrections over days.
aquaforest.eu/en/products/lab/microelements/lithium/