Duradrakon hardening salt
Hardening salt mixture for reverse osmosis water
Pure RO water is not suitable for direct use in the aquarium, except in a few special cases (pure flow-through tank, black water biotope). The few minerals it still contains would be used up too quickly. It is therefore sensible and correct to harden the water used to a carbonate hardness of 1 - 3 °dH to supply fish and plants. If you do not want to or cannot do this by blending with tap water (e.g. source water that is too heavily contaminated!), you will need a hardening salt that supplies the water with a defined quantity of minerals.
- The ion standard ratio is set approximately
- The supply of all trace elements is guaranteed
- No chemical tricks such as the addition of organic or acidic salts are used (therefore no oxygen consumption or strange pH jumps during use)
Requirements
This hardening salt is only suitable for aquarium water with sufficient free CO₂ (preferably from a regulated CO₂ system) and a pH of well below 7, as otherwise some components will only dissolve very slowly or not completely!
For Malawi and Tanganyika lake tanks other hardening salt mixtures should be used.
Composition
22.2 % carbonate, 17.0 % hydrogen carbonate, 16.8 % calcium, 12.9 % sulphate, 8.1 % chloride, 5.7 % sodium, 4.6 % magnesium, 2.1 % potassium, 0.05 % trace elements, remainder: crystal water
At a dosage of 10 g per 100 litres of fresh water, this corresponds approximately to the following addition of important substances:
62 mg/l hydrogen carbonate, 17 mg/l calcium, 13 mg/l sulphate, 8 mg/l chloride, 6 mg/l sodium, 5 mg/l magnesium, 2 mg/l potassium
Dosage
3.5 g salt mixture / 100 litres of osmosis water results in 1.0 °dH KH or 1.2 °dH GH
2.9 g salt mixture / 100 litres of osmosis water results in 0.8 °dH KH or 1.0 °dH GH
Standard kitchen units of measurement
- Levelled teaspoon: 1.6 g
- Heaped teaspoon: 6.4 g
- 5 ml measuring spoon (as often enclosed in medicine packs): 2,9 g
Use
The poorly soluble calcium carbonate contained in the mixture dissolves under CO₂ consumption in the form of soluble calcium hydrogen carbonate (which breaks down again into CO₂ and calcium carbonate during drying, which is why it only exists in solution). The more free CO₂ is present, or the lower the pH, the faster this process can take place.
At pH 6.0, this can happen in minutes, especially with a readjusting CO₂ system, but at pH just below neutral and relatively little CO₂ in the water, it can also take a few hours.
The slight turbidity that forms for a short time is harmless for fish and plants.
You can Duradrakon by circulating it vigorously in an external water treatment system before changing the water.
If neither method is practicable, the very easily soluble mixtures Duradrakon GH-Plus and Duradrakon KH-Plus is also possible.
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2 - 10 by 26 Reviews
16 November 2017 13:50
An excellent product that fulfils the...
Duradrakon hardening salt
An excellent product that fully fulfils the wishes of an aquarist.
10 July 2017 08:25
Best hardening salt I have ever...
Duradrakon hardening salt
Best hardening salt I've ever had.
30 September 2016 13:47
Easy to dose, effective...
Duradrakon hardening salt
Easy to dose, effective.
29 September 2016 09:32
For the dosage I use...
Duradrakon hardening salt
I use small 2 ml syringes for dosing, I can easily draw the powder into them and always have the same amount of powder per water canister.
10 March 2015 16:31
I use Duradrakon alone...
Duradrakon hardening salt
I use Duradrakon alone for osmosis water, adding nitrate, phosphate and iron....ready!
10 March 2015 07:30
Very good ...
Duradrakon hardening salt
Very good
10 February 2015 20:58
Softening of Osemosis water...
Duradrakon hardening salt
Softening of Osemose water
20 July 2014 21:31
I use for osmosis water. S...
Duradrakon hardening salt
I use for osmosis water. Very good product.
7 April 2014 12:35
Duradrakon is well suited for...
Duradrakon hardening salt
Duradrakon is well suited if you want to make osmosis water suitable for discus. However, it only dissolves if the pH has been lowered sufficiently beforehand. In other words, you need pH/KH-Minus beforehand. This means that the increase in KH due to Duradrakon is naturally less than initially calculated. You simply need more powder than expected. After finding the right dose, the pH, KH and GH can be adjusted to the point. This correlation could be explained on an instruction leaflet.
I use the salt in a large storage tank and not directly in the tank. Unfortunately, the pH rises again quickly shortly after adding pH/KH-Minus if the tank is well aerated. Therefore, a new pH adjustment is often required shortly after a water change, i.e. the pH must first be lowered for the salt to be soluble. Even then it takes time until enough is dissolved. If the water is not used immediately, the pH must be readjusted the very next day.
27 December 2013 15:47
The product is very difficult to sol...
Duradrakon hardening salt
The product is very difficult to dissolve. I have a CO₂ system in operation. pH value is 6.5. Only osmosis water is used. Every week 40 litres are exchanged. I would like to harden to 3...4 KH. For this I need 6 gr. Duradrakon. The Kh is very difficult to achieve. I can't measure it even after a day. It is then around 1...2 KH. I therefore have to use considerably more.
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