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What one dose does
PARAMETER
1 ml / 100 L
Phosphate
+0.032 ppm PO₄
To raise phosphate by 0.02 ppm PO₄ in 100 L: 0.63 ml.
How it’s used
Beginner: 2.5 ml (1/2 cap) per 160 L (40 US gal) once a week. Typical target 0.02-0.05 mg/L phosphate. Formula: ml = 0.31 x liters x mg/L rise. Raise slowly.
Cautions
• Raise slowly; easy to overshoot low targets.
Sources
Sodium phosphate, 0.117% P (0.270% P2O5). Note Seachem's own URL is misspelled 'phoshorus'.