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To raise potassium by 20 ppm in 100 L: 26.4 ml.
1 capful (5 ml) per 50 US gal 3-4 times a week, adjusted by test to K 380-405 ppm. Drip batches: 0.05 ml per gal per ppm.
• Do not premix with buffers or alkalinity supplements
Ionic potassium solution (~76 g/L K implied).
continuumaquatics.com/marine_mm/reefbasis_potassium.php