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To raise alkalinity by 1 dKH in 100 L: 18.8 ml.
355 g Na2CO3 (BRS staff answer) to 1 US gal. Stoichiometric 355/105.99 x 2 / 3.785 = 1770 meq/L; BRS calculator example (100 gal, +1.5 dKH -> 107.1 ml) implies 1893 meq/L (Randy basis). perMlEffects use calculator basis; stoichiometric is ~7% lower.
• Keep alkalinity increases <=1.4 dKH/day and pH swings <=0.2 per dose.
• Dose slowly into high flow; local high pH can precipitate CaCO3/Mg(OH)2 (snow).
• Laundry 'washing soda' is sodium carbonate but not food grade; prefer food/pharma grade or self-baked baking soda.
• Avoid with kalkwasser when tank pH is already >=8.4 (use bicarbonate instead).
• Anhydrous soda ash absorbs moisture; store sealed.
355 g made up to 1 US gal total.
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