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To raise alkalinity by 1 dKH in 100 L: 37.7 ml.
1 cup + 2 Tbsp (302 g per BRS bulk page) to 1 US gal. Stoichiometric 950 meq/L; BRS calculator example (100 gal, +1.5 dKH -> 214.2 ml) implies 947 meq/L.
• Keep alkalinity increases <=1.4 dKH/day (BRS).
• Never premix with the calcium part.
• Slow to dissolve at ~1 cup per gallon; warming helps (do not boil - converts toward carbonate).
302 g made up to 1 US gal total.
bulkreefsupply.com/instructions/article/brs-pharma-sodium-bicarbonate-mixing-and-dosing-instructions