e.g. 5 mL per gal/L of mixed solution.
Nitrogen concentration in tank
—
EC ≈ — mS/cm · Total dissolved ≈ — ppm
| Nutrient | ppm (mg/L) | mg per tank |
|---|
How the math works
Concentrate grams = dose mL × density. Element ppm = (grams × element % × 10000) / tank mL. NPK percentages are given as elemental N, P₂O₅, K₂O — multiply P by 0.4364 and K by 0.8301 for elemental P/K.
EC ↔ ppm depends on the scale: US (500), EU (640), hydroponic (700). EC in mS/cm × scale ≈ TDS in ppm. Plant EC targets: seedlings 0.5–0.8, veg 1.2–1.8, flower 1.8–2.5.