Info: Seachem Flourish Phosphorous™ Dosing Instructions


BEGINNER: Use 2.5 mL (half a cap) for each 80 L (20 US gallons) once or twice a week or as needed in response to signs of phosphorus deficiency (e.g. stunted growth, plant dark green).

EXPERT: The beginner dose raises phosphorus by 0.05 mg/L (0.15 mg/L phosphate). The ideal phosphate level will vary, but generally ranges from 0.15–1.0 mg/L. Use MultiTest™: Phosphate to monitor phosphate levels. To target a specific phosphate increase, dose according to the following formula: 0.8vp=m, where v= volume of tank in gallons, p=desired phosphate increase and m=volume of product to use in mL. For example to raise 20 gallons to 0.1 mg/L phosphate you would use: 0.8*20*0.1=1.6 mL.


Flourish Phosphorus™ Dosing Table

The following dosing table provides the "beginner" dose of Flourish Phosphorus™ for various water volumes. This table applies to bottles of 100 mL - 500 mL.  Please note that the 2L and 4L bottles of Flourish Phosphorus™ have larger cap volumes than the smaller bottles.

Water Volume Dose in mL Dose in caps Dose in drops
1 quart (1 L) 0.025 mL 1/160 Capful 0.6 Drops
1 gallon (4 L) 0.1 mL 1/40 Capful 2.5 Drops
5 gallons (20 L) 0.6 mL 1/8 Capful 12.5 Drops
10 gallons (40 L) 1.25 mL 1/4 Capful 25 Drops
20 gallons (80 L) 2.5 mL 1/2 Capful 50 Drops
40 gallons (160 L) 5 mL 1 Capful 100 Drops
50 gallons (200 L) 6 mL 1 1/4 Capful 120 Drops


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