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To raise strontium by 1 ppm in 100 L: 3.5 ml.
1 capful (5 ml) per 50 US gal 3-4 times a week, adjusted by test to 8-13 ppm. Drip batches: 0.133 ml per gal per ppm.
• Do not premix with buffers or alkalinity supplements
Strontium chloride solution (~28 g/L Sr implied). Can be premixed with Ca and Mg supplements.
continuumaquatics.com/marine_sr/reefbasis_strontium.php