Randy Holmes-Farley Recipe #1 alkalinity part (baked baking soda)
alkalinity
Na2CO3
Manufacturer data
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What one dose does
PARAMETER
1 ml / 100 L
Alkalinity
+0.0533 dKH
To raise alkalinity by 1 dKH in 100 L: 18.8 ml.
How it’s used
594 g (about 2 1/4 cups) baking soda baked at 300 F for 1 h (-> 375 g Na2CO3) made up to 1 US gal -> ~1,900 meq/L (5,300 dKH) published; stoichiometric 594/84.01/3.785 = 1868 meq/L.
Cautions
• 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.