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What one dose does
PARAMETER
1 g / 100 L
Magnesium
+2.4227 ppm
To raise magnesium by 50 ppm in 100 L: 20.6 g.
How it’s used
Dissolve first: basic 2.5 g (~3/4 tsp) per 20 US gal in 16 fl oz fresh water every other day for 1,290-1,320 ppm. Precise: grams = ppm rise x US gal / 64 (or x liters / 243).
Cautions
• Wear gloves and goggles; solution can get very hot when water is added (anhydrous salts).
• Dissolve fully and let cool before dosing.
Sources
Anhydrous MgSO4 + MgCl2. The page's 'treats up to' figure cites 1,200 g, a size not in its own size list (200 g-16 kg).