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.

10 of 23 reviews

Average rating of 4.7 out of 5 stars


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16 November 2017 13:50

Review with rating of 5 out of 5 stars

Ein hervorragendes Produkt, we...

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

27 June 2024 00:00

Review with rating of 5 out of 5 stars

Bewertung ohne Text

Bewertung ohne Text

10 March 2015 16:31

Review with rating of 5 out of 5 stars

Ich verwende Duradrakon allein...

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

29 September 2016 09:32

Review with rating of 5 out of 5 stars

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

Review with rating of 5 out of 5 stars

Einfach zu dosieren, wirkungsv...

Einfach zu dosieren, wirkungsvoll.

10 July 2017 08:25

Review with rating of 5 out of 5 stars

Bestes Aufhärtesalz das ich...

Bestes Aufhärtesalz das ich bisher hatte.

7 July 2020 09:18

Review with rating of 5 out of 5 stars

Sehr gute Qualität

Man kann damit genau auf die gewünschte Härte das Wasser aufhärten

13 January 2024 13:08

Review with rating of 5 out of 5 stars

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

Review with rating of 5 out of 5 stars

Nur noch Duradrakon

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

10 March 2015 07:30

Review with rating of 5 out of 5 stars

Sehr gut ...

Sehr gut

Accessories

Average rating of 5 out of 5 stars

Measuring spoon small not graduated 60 mm long
For measuring and dosing small quantities of fertilizer or hardening salt

From €0.69*

Average rating of 5 out of 5 stars

Measuring spoon 10 ml white
Measurement and dosage of our water hardeners and mineral salts

From €0.79*

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