Duradrakon Hardener Salt

Hardener salt combination for reverse osmosis water

Pure RO water is not suitable for direct use in an aquarium, except in a few special cases (pure flow tanks, black water biotopes). The little remaining amount of minerals would be absorbed to quickly. In order to provide the right supply for fish and plants, it is therefore appropriate and correct to increase the water hardness to a carbonate hardness of 1 - 3 °dH. If you do not wish to blend in tap water (or if the tap water is not pure enough!), needs a hardener salt that provides the water with a defined amount of minerals.

  • Approximately the standard ion ratio is set
  • Supply with all trace elements is ensured
  • No chemical tricks such as the addition of organic or acid salts are used (therefore no oxygen consumption or strange pH jumps during application)

Requirements

This hardener salt is only suitable for tank water with a sufficient amount of free CO₂ (preferably provided by a well-adjusted CO₂-device) and a pH-value significantly below 7, as otherwise some ingredients would only dissolve very slowly or not completely!

For Malawi- and Lake Tanganyika tanks, please use other hardener salt combinations.

Ingredients

22.2 % Carbonate, 17.0 % Hydrogencarbonate, 16.8 % Calcium, 12.9 % Sulfate, 9.9 % Chloride, 5.7 % Sodium, 4.6 % Magnesium, 2.1 % Potassium, 0.05 % trace elements, remnant: crystal water

At a dosage of 10 grams per 100 liters of fresh water, this is equivalent to approximately the following addition of important substances:

62 mg/l Hydrogencarbonate, 17 mg/l Calcium, 13 mg/l Sulfate, 8 mg/l Chloride, 6 mg/l Sodium, 5 mg/l Magnesium, 2 mg/l Potassium

Dosage

3.5 g salt combination / 100 l osmosis water produce 1.0 °dH CH or 1,2 °dH TH respectively
2.9 g salt combination / 100 l osmosis water produce 0.8 °dH CH or 1.0 °dH TH respectively

Common measurements

  • Level teaspoon: 1.6 g
  • Heaped teaspoon: 6.4 g
  • 5 ml measuring spoon (as found in medicine packs): 2.9 g

Application

The heavy soluble calcium carbonate contained in the mixture, dissolves itself by using CO₂ to convert itsself into the form of soluble calcium hydrogencarbonate (it disintegrates into CO₂ and calcium carbonate during drying, which is why it only exists dissolved). The more available free CO2 that is provided, as well as the lower that the pH-value is, the faster that this process can progress.

By pH 6.0 this process can complete in a matter of minutes, especially when a controlled CO₂ system is in operation, but if the pH-value is a little under the neutral point and when relatively low CO₂ is present in the water, the process can however then take a some hours.
The short lived water “clouding” is in no manner damaging for fish or plants.

One can also dissolve Duradrakon through strong water circulation in an external water preparation container before performing the exchanging water.

When neither the first nor the other method is practically possible then it is however also possible to apply the very easily soluble mixtures Duradrakon CH-Plus and Duradrakon TH-Plus, though there is a slightly increased complete-salt content.

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16 November 2017 13:50

Ein hervorragendes Produkt, we...

Ein hervorragendes Produkt, welches dem Wunsch eines Aquarianers voll entspricht.

29 February 2004 12:35

Es bietet die Möglichkeit UO-W...

Es bietet die Möglichkeit UO-Wasser ganz genau auf eine passende Härte zu bringen. Eine Wassertrübung durch das Härtesalz ist normal und dauert bei richtiger Filterung ca. 15min. Kleiner Tip : Duradrakon in sehr kohlensäurehaltigen Mineralwasser "vorlösen" und dann mit dem UO-Wasser mischen. Auch eine Temperatur von über 20°C ist beim Lösen hilfreich.

29 September 2016 09:32

Für die Dosierung verwende ich...

Für die Dosierung verwende ich kleine 2 ml Spritzen, da kann ich das Pulver gut hineinziehen und habe so immer die gleiche Menge Pulver je Wasserkanister.

30 September 2016 13:47

Einfach zu dosieren, wirkungsv...

Einfach zu dosieren, wirkungsvoll.

10 July 2017 08:25

Bestes Aufhärtesalz das ich...

Bestes Aufhärtesalz das ich bisher hatte.

7 July 2020 09:18

Sehr gute Qualität

Man kann damit genau auf die gewünschte Härte das Wasser aufhärten

13 January 2024 13:08

Sehr guter Artikel

Ich nehme das Produkt auch immer wieder mal. Bei mir funktioniert es einwandfrei. Dem Problem mit der Löslichkeit entgegne ich mit Mineralwasser, in dem löse ich es vorab schon mal etwas auf. Danach kommt es ins Wechselwasser und wird dort noch ein paar Stunden umgewälzt.

15 October 2022 20:16

Nur noch Duradrakon

Super angestimmtes Nährstoffverhältnis. Für mich und mein Aquarium gibts kein besseres Aufhärtesalz!

10 March 2015 16:31

Ich verwende Duradrakon allein...

Ich verwende Duradrakon alleinig für Osmosewasser.Nitrat, Phosphat und Eisen dazu....fertig!

15 January 2020 12:34

Gutes Produkt, halt Qualität von DRAK

Seit ca. zwei Monaten nutze ich zum wöchentlichen Wasserwechsel (60%) ausschließlich nur noch Osmose Wasser. Aufgehärtet wird mit Duradrakon, 8g auf 75ltr.. Das Salz ist nach ca. einer Stunde vollständig gelöst und das Aquarienwasser wieder klar. Sicher gibt es auch Salz zum kleinen Preis, aber mit Duradrakon bekommt man die gewohnte hohe Qualität von DRAK. Benutze in meinen Becken auch Eudrakon N, Eudrakon P und Kramer Drak, und sie laufen richtig gut. Bei DRAK hat man immer eine genaue Inhaltsangabe auf den Produkten. Die Lieferzeit ist unschlagbar.

Accessories

Measuring spoon small not graduated 60 mm long
Measuring spoon 0.1 or 0.3 ml not graduated 60 mm long for example to measure and dispense small amounts of fertilizer or water hardener

From €0.69*
Measuring spoon 10 ml white
Measurement and dosage of our water hardeners and mineral salts

From €0.79*

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