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What one dose does
PARAMETER
1 ml / 100 L
Calcium
+2 ppm
To raise calcium by 20 ppm in 100 L: 10 ml.
How it’s used
Liquid CaCl2 for correcting Ca shortfalls; dose by test results. Needs adequate KH to be effective; check Mg is in range first.
Cautions
• Old-formula bottles (no red badge) are weaker: 15 ppm per 10 ml/100 L
Sources
Page lists both formulas. New formula (red badge) 10 ml/100 L -> +20 ppm, same as the Lab Ca Plus. No explicit max for new formula on this page (Lab version: 10 ml/100 L/day).