Add 5 ml / 20 litres, either weekly or after fertilizer check (JBL Fe Test set).
JBL Ferropol may also be used as day fertilizer; first, add the full dose to the aquarium water, followed by an outside screw top for 100 litres of aquarium water added daily. The dose may need to be adjusted depending on the intensity of the vegetation. Use the JBL Iron Test Set to monitor the optimum iron content of 0,1-0,2 mg/l.
Outside screw top: sufficient for 10 l of aquarium water
I nside screw top: sufficient for 30 l of aquarium water
Repeat doses in full amount every 1 to 2 weeks according to need
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