Dennerle Plant System E15

Dennerle Plant System E15

  • Iron fertiliser tablets
  • For heavily planted aquariums
  • For intensive leaf colours
  • Immediate and long-term effect
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Dennerle Plant System E15 is an iron fertiliser in tablet form for aquatic plants. Plant System E15 supplies all aquarium plants with immediately effective, 2-valent nutrient iron and thus ensures fresh, splendid greenery. Symptoms of deficiency such as yellow, glassy leaves are largely cured, young leaves sprout a rich green again.
Iron is of central importance for all aquarium plants. It is needed for the formation of the vital leaf green, because without leaf green the plant cannot carry out photosynthesis. Iron deficiency is immediately apparent in the young leaves, which appear pale and yellowish (iron chlorosis). Important to know: Plants can only absorb so-called bivalent iron. Unfortunately, this is not stable in the aquarium, but is quickly oxidised and thus converted into ineffective trivalent, "brown" iron. Since tap water contains practically no iron, aquarium plants are dependent on regular iron fertilisation. Special protective shells - so-called chelates - protect the E15 iron effectively and keep it available to plants in the aquarium for a long time (depot effect). E15 is phosphate and nitrate-free and therefore does not promote algae growth. Special note: Commercial iron tests often cannot detect chelated iron. These tests then show inadequate results, although there is actually enough iron in the aquarium water. For optimal use, Dennerele recommends using Plant System V30 (complete fertiliser) und Plant System S7 (vital substances). The fertiliser tablets are offered in 20, 40 and 100 pieces.

Manual Dennerle Plant System Set - - download PDF

Manual Dennerle Plant System E15 - - download PDF


  • Iron for large and heavily planted aquariums
  • With 2-valent, directly plant-available nutrient iron
  • For lush green leaves and intense colours
  • Immediate and long-term effect
  • High coverage due to highly concentrated active ingredients
  • Optimum effect in the Plant System in combination with V30 and S7


1 tablet per 100 l adds 0,27 mg/l iron to the aquarium water.
Regular use results in an iron content in the optimal range of 0,05 - 0,2 mg/l.

Simply add the tablets to the aquarium, preferably after a partial water change. They dissolve slowly within a few days.


K-fertiliser solution 3 with trace nutrients, with complexing agents DTPA, EDTA, HEDTA
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 mass: see product packaging; Distributor: Dennerle GmbH, D-66981 Münchweiler, Germany

Secondary constituents: 2,69 % S water-soluble Sulphur, 4,02 % Na water-soluble Sodium, 55,9 % organic matter. Processing aids: As filler: sodium sulphate; as pressing aid: cellulose, silicon dioxide, PVP, calcium stearate. Application aids: EDTA as complexing agent. Storage instructions: Store in a dry place at room temperature. Protect from sun, heat and frost. Keep out of reach of children and pets. Instructions for use: Only for fertilising ornamental plants in aquaria. For detailed instructions for use and dosage, see above directions for use. Note: Recommendations of the official advice take precedence.



Dennerle has been operating in Vinnigen since its foundation in 1966 and, after more than 50 years of company history, the building blocks Dennerle relies on is experience. The philosophy behind Dennerle is to create a small and tangible, intact piece of nature, in harmony with the natural environment. That is why sustainability is a company-wide concept and is implemented at every possible point. In order to achieve an ecologically balanced aquarium, Dennerle relies on a system that is based on 5 pillars. Animals, plants, water, substrate and lighting. Dennerle offers the optimum equipment to bring this complex, but not complicated system into harmony.

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