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What one dose does
PARAMETER
1 g / 100 L
Boron
+1.134 ppm
Alkalinity
+0.147 dKH
To raise boron by 0.5 ppm in 100 L: 0.44 g.
How it’s used
Pure sodium tetraborate decahydrate (e.g., 20 Mule Team is ~pure borax; avoid 'borax substitute' detergents).
Cautions
• Borate counts as alkalinity in titration kits (RHF found borax-spiked water reading 4.2 meq/L vs 0.18 baseline): avoid borate-based 'buffers' for alkalinity.
• Natural seawater ~4.4 ppm B; test-driven only.
• Mixing boric acid + borax gives a near pH-neutral boron supplement.
pH effect: slightly raises.
Sources
Pure sodium tetraborate decahydrate (e.g., 20 Mule Team is ~pure borax; avoid 'borax substitute' detergents).