App-standard KH2PO4 stock (1 g/L)
phosphate
KH2PO4
Manufacturer data
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What one dose does
PARAMETER
1 ml / 100 L
Phosphate
+0.007 ppm PO₄
To raise phosphate by 0.02 ppm PO₄ in 100 L: 2.9 ml.
How it’s used
1 g/L x 0.6979 = 697.9 mg/L PO4; 1 ml in 100 L = 0.00698 ppm PO4. Hanna 'ppb P' kits: ppm PO4 / 3.066 = ppm P.
Cautions
• 1 g in 100 L adds ~7 ppm PO4 (~70-230x a reef target of 0.03-0.1 ppm) - ALWAYS dose from a dilute stock.
• Only dose when PO4 is bottomed out (undetectable/<~0.02 ppm) with symptoms (pale corals, dinos/cyano under ULNS, carbon-dosing stall).
• Raise in small steps (<=~0.02-0.03 ppm per day, app policy) and re-test; overshoot fuels algae.
• Adds a trivial amount of K.
Sources
1 g made up to 1 L total.
derived (app standard)