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To raise potassium by 20 ppm in 100 L: 10.8 ml.
1 drop per 100 L daily, adjusted to coral load (a maintenance trickle; use Lab Kalium for corrections).
1 drop/day adds only ~0.12 ppm K (at ~15 drops/ml).
aquaforest.eu/en/products/seawater/water-treatment/kalium-2/