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What one dose does
PARAMETER
1 g / 100 L
Strontium
+0.3 ppm
To raise strontium by 1 ppm in 100 L: 3.3 g.
How it’s used
Beginner: 6 g (1 level tsp) per 150 L (40 US gal) twice a week; may go directly into the tank. Target 8-12 mg/L. Drip formula: grams = liters x mg/L rise / 30.
Cautions
• Excess strontium can deplete alkalinity.
• Do not mix directly with carbonate supplements.
Sources
CONFLICT: page also says each 6 g per 150 L raises Sr ~2 mg/L, but its formula and 30,000 ppm concentration give 1.2 mg/L. Stored the formula (two consistent figures). No daily maximum stated.