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To raise zinc by 0.5 ppb in 100 L: 0.13 ml.
Maker’s daily maximum: 1 ml per 100 L (1 ml for 100 L).
Lab line: dose from ICP-OES results toward 0.001-0.007 ppm (from original page). Max 1 ml per 100 L per day; split larger corrections over days.
• Original and NEW formulations differ in strength; check the bottle
aquaforest.eu/en/products/lab/microelements/new-zincum/