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What one dose does
PARAMETER
1 g / 100 L
Calcium
+3.5961 ppm
To raise calcium by 20 ppm in 100 L: 5.6 g.
Maker’s daily maximum: 0.55 g per 100 L (0.55 g for 100 L).
How it’s used
Dissolve first. Basic: 2 g (~1/2 tsp) per 20 US gal in 8 fl oz fresh water every other day for 412-450 ppm. Advanced: stock of 10 g in 8 fl oz; each ml raises 1 US gal by 2.5 ppm; dose ml/day = ppm drop / 2.5 x US gal.
Cautions
• Do not add undissolved powder directly to an aquarium with livestock (anhydrous CaCl2 releases heat).
Sources
Anhydrous calcium chloride. maxDose derived from the stock-solution limit (10 ml stock per 20 US gal daily; 10 ml x 10 g / 236.6 ml = 0.42 g).