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What one dose does
PARAMETER
1 g / 100 L
Calcium
+3.6 ppm
Magnesium
+0.18 ppm
To raise calcium by 20 ppm in 100 L: 5.6 g.
Maker’s daily maximum: 6.7 g per 100 L (6.7 g for 100 L).
How it’s used
Beginner: 5 g (1 level tsp) per 150 L (40 US gal) twice a week, dissolved in >=250 ml fresh water. Target 380-420 mg/L. Drip formula: grams = liters x mg/L rise / 400. Max 10 g per 150 L per day.
Cautions
• Excess calcium can deplete alkalinity.
• Do not mix directly with carbonate supplements; dose >=30 min apart.
Sources
Non-caustic ionic calcium powder. Two manufacturer figures differ by ~10% (12 vs 13.3 mg/L per 5 g/150 L); stored the explicit 12 mg/L statement.