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What one dose does
PARAMETER
1 g / 100 L
Magnesium
+4.206 ppm
To raise magnesium by 50 ppm in 100 L: 11.9 g.
How it’s used
Dissolve 2.5 g (about 1/2 tsp) in 8 oz (236 ml) RO water per 20 US gal and add in high flow every other day until target (1250-1350 ppm). Re-test before repeating; maker's factor may overstate potency.
Cautions
• May get hot when dissolved: mix outside the tank, wear gloves
• Hygroscopic: keep tightly closed
Sources
Maker says anhydrous salts, 'over 4x as strong' as hydrated products. The published factor is physically implausible (see effect note); treat as an upper bound.