Bulk Reef Supply Pharma Soda Ash (sodium carbonate) (mixed solution, per ml)
alkalinity
Manufacturer data
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What one dose does
PARAMETER
1 ml / 100 L
Alkalinity
+0.0531 dKH
To raise alkalinity by 1 dKH in 100 L: 18.8 ml.
Maker’s daily maximum: 26.4 ml per 100 L (26.4 ml for 100 L).
How it’s used
Mix 356 g (1.5 cups) per 1 US gal final volume. Correct to target, then dose the BRS 5-day amount /5 daily, 1:1 with the Ca solution; adjust +/-10%/day. Preferred alk part for tanks under pH 8.4.
Cautions
• Raise alk no more than 0.5 meq/L (1.4 dKH) per day
• Raises pH: keep each dose's pH rise under 0.2
• Dose into high flow; can precipitate if dosed next to Ca
Part of BRS 2-Part
Sources
Conflict: BRS calculator's 0.5 meq/L per ml/gal is ~7% stronger than the 356 g/gal recipe arithmetic (0.469). The BRS worked example (107.1 ml raises 100 gal by 1.5 dKH) matches the calculator. Prefer calculator for consistency with BRS users; flag for app tolerance. maxDose derived from BRS limit of 0.5 meq/L (1.4 dKH) per day.