Calcium acetate (anhydrous)
calcium
Ca(CH3COO)2
Partly derived
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What one dose does
PARAMETER
1 g / 100 L
Calcium
+2.534 ppm
Alkalinity
+0.3544 dKH
To raise calcium by 20 ppm in 100 L: 7.9 g.
How it’s used
Food grade (E263). Commonly sold as monohydrate (MW 176.18, Ca 0.2275); confirm hydrate.
Cautions
• It is also a carbon dose: +10 ppm Ca in 100 L needs 3.95 g = 1199 mg C, about 7.3 ml 80-proof vodka-equivalent - far above typical vodka starting doses. Not suitable as a primary Ca supplement in most tanks.
• All carbon-dosing guardrails apply (skimmer, measurable NO3/PO4, O2 demand, bacterial bloom).
• Treat its alkalinity contribution as delayed and dependent on bacterial activity.
pH effect: slightly raises over time (acetate metabolism generates bicarbonate); no strong immediate effect.
Sources
Food grade (E263). Commonly sold as monohydrate (MW 176.18, Ca 0.2275); confirm hydrate.
pubchem.ncbi.nlm.nih.gov/
forums.reefcentral.com/threads/vodka-vinegar-biopellets-and-other-organic-carbon-dosing.1472463/page-3