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What one dose does
PARAMETER
1 ml / 100 L
Potassium
+1.0489 ppm
To raise potassium by 20 ppm in 100 L: 19.1 ml.
How it’s used
200 g KCl made up to 1 L (solubility ~340 g/L at 20 C) -> 200 x 0.5245 = 104.9 g/L K (104.9 mg K per ml).
Cautions
• Test K first; many hobby K kits are imprecise - prefer ICP or a validated kit. Natural seawater ~400 ppm K.
• App policy: raise K no more than ~20 ppm/day, dissolved and dosed slowly into high flow (concentrated KCl locally is harmful; brands warn stronger solutions can brown corals).
• Sanity: raising 100 L by 10 ppm K needs 1.91 g KCl.