Additional care for plants: supplementary potassium fertiliser for aquascaping aquariums Dosing is dependent on intensity of illumination, Co2 supply and consumption. Healthy plant growth, prevents potassium deficiency Checking of dosage with JBL potassium test Package contents: 1 bottle ProScape K Macroelements. Use for e.g. high power light aquariums with CO2: 6 ml/100 l daily, under weak light conditions without CO2: 4 ml/100 l weekly