Use 1 capful (5 mL) for each 200 L (50 gallons) or as required to maintain about 0.10 mg/L iron. For smaller doses please note that each cap thread is about 1 mL. Use MultiTest®: Iron test kit to monitor iron concentrations. Due to rapid utilization, test within 30 minutes. Use as needed to combat signs of iron deficiency (usually seen in new growth) which include: chlorosis (yellowing) of tissue between veins and short and slender stems.
Flourish Iron™ Dosing Table
| Water Volume | 1 qt / 1 L | 1 gal / 4 L | 10 gal / 40 L | 50 gal / 200 L |
| Flourish Iron™ Dose (mL) | 0.025 | 0.1 mL | 1 mL | 5 mL |
| Flourish Iron™ Dose (caps) |
1/200 capful |
1/50 capful |
1/5 capful |
1 capful |
| Flourish Iron™ Dose (drops) |
0.5 drops |
2 drops |
20 drops |
100 drops |
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