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What one dose does
PARAMETER
1 ml / 100 L
Phosphate
+0.0454 ppm PO₄
To raise phosphate by 0.02 ppm PO₄ in 100 L: 0.44 ml.
How it’s used
For phosphate-limited tanks. Test, dose to ~0.02 ppm phosphate, retest after 24 h; maintain 0.01-0.02 ppm until nitrate is 3-5 ppm. If phosphate stays up, the system may be carbon-limited.
Cautions
• Do not overdose.
• Multiple label strengths in circulation; confirm on bottle.
Sources
Brightwell says more than one strength has been sold. A Reef2Reef thread (search snippet; page itself was 403) reports a newer, diluted bottle with a much lower figure (~0.05 ppm per ml per gal). The stored 1.2 figure is the AquaCave/older one; with a dilute bottle it would under-dose by roughly 20x, and the reverse mistake would overdose by the same factor. App should ask the user to confirm the label figure.