Dennerle E15 FerActiv – Iron Fertilizer


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E15 FerActiv fertilizer provides all aquarium plants with immediately effective bivalent nutrient iron and thus gives them a superb, very fresh green color.


Dennerle E15 FerActiv – Iron Fertilizer


  • E15 FerActiv iron fertilizer provides all aquarium plants with divalent nutrient iron that they can use immediately, thereby ensuring a beautiful, fresh green colour.
  • Symptoms of deficiency such as yellow, glassy leaves are thereby virtually completely cured, while young leaves can once again display a rich, green colour.

Iron is of crucial importance for all aquarium plants. It is needed for generating the all-important chlorophyll. Without chlorophyll, the plant cannot photosynthesize. The effects of iron deficiency are immediately apparent: the young leaves appear pale and yellowish (iron-induced chlorosis).

Please note: plants can only absorb divalent iron. This is unfortunately not stable in an aquarium, and is quickly oxidised to become ineffective trivalent “brown” iron. Tap water contains virtually no iron. Aquarium plants are therefore reliant upon regular iron fertilization.

How much should I use?

Application: Every 4 weeks (e.g. always on the 15th of the month)
Dosage: 1 tab E15 FerActive per 100 litres of aquarium water

In total, 20 tabs for 2000 litres of aquarium water


NK fertilizer 2+14 with iron and manganese, with complexing agent EDTA

2.1%   N total nitrogen, 14% K2O water soluble potassium oxide
2.98% Fe total iron = water-soluble iron*.
0.74% Mn total manganese = water soluble manganese*
*up to 50% EDTA chelation at pH 3-7

Net weight: see packaging
Distributor: Dennerle GmbH, 66981 Münchweiler, Germany

Other constituents: 2.69% S water soluble sulphur, 4.02 % Na water soluble sodium, 55.9 % organic substance
Conditioning aid: As filler: sodium sulphate; as pressing aid: cellulose, silicon dioxide, PVP, calcium stearate
Application aids: As complexing agent: EDTA
Storage instructions: store in a dry place at room temperature. Store away from sunlight, heat and frost. Store out of reach of children and pets.
Application guidelines: Only for fertilization of ornamental plants in aquaria.
See enclosed package leaflet for detailed application instructions and dosages. Note: Official guidance and recommendations take precedence.

Packaging sizes: 20 tabs (item no. 4549) and 40 tabs (item no. 4550)

Additional information


20 tabs