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What one dose does
PARAMETER
1 ml / 100 L
Calcium
+0.0096 ppm
Alkalinity
+0.0013 dKH
To raise calcium by 20 ppm in 100 L: 2,083 ml.
How it’s used
Advanced users only. Stir ~6 g (2 tsp) into 1 US gal RO water, let settle several hours, decant the clear liquid into a doser and drip slowly over several days; discard the sediment. Adjust drip rate from Ca/alk tests.
Cautions
• Never add the powder directly to the tank
• Strongly alkaline: drip slowly to avoid pH spikes
• Maintenance method, not for fast correction of low Ca
Sources
Calcium hydroxide. The maker's 48 ppm figure is a bit higher than stoichiometry from 6 g/gal (6 g Ca(OH)2 = 81 mmol = 3.25 g Ca; in 75.7 L = 43 ppm, assuming all dissolves) and the label equates 20 gal with 80 L (actually 75.7 L). Size from retailer listings.