US gallons by default (1 gal = 3.78541 L). All stocks are DIY-ready, soluble in 1 L room-temp water.
| Element | Compound | g/L |
|---|
* Iron stock: Add 0.8 g ascorbic acid + 2 g citric acid per 1 L, store refrigerated (4 °C) in amber glass for up to 8 weeks shelf life.
** Strontium chloride hexahydrate: max solubility ≈ 190 g/L at 20 °C – dilute if precipitation occurs.
1 drop = 0.05 mL (standard pipette). µg/L elements use 50x diluted stock (1.0 g/L) for ultra-precise drop-wise dosing.