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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3 - 10 by 26 Reviews
31 October 2013 08:58
Dissolves somewhat poorly in pure...
Duradrakon hardening salt
Dissolves somewhat poorly in pure, already stale osmosis water. Next time I will add it directly to the inlet of the osmosis system when filling the storage tank.
26 October 2013 13:52
Easy to use and also easy to...
Duradrakon hardening salt
Easy to use and also easy to dose.
3 October 2013 09:22
For my discus fish...
Duradrakon hardening salt
For my discus fish
4 June 2013 14:01
I use the product to add salt to my...
Duradrakon hardening salt
I use the product to add salt to my demineralised water.
1 March 2006 17:52
I only use osmosis water ...
Duradrakon hardening salt
I only use osmosis water for water changes. I have previously used a product from a well-known manufacturer for remineralisation. The conductivity it produced did not match the total hardness produced at all. There seems to be an abundance of chlorides in it. In terms of conductivity, it was anything but soft water and I used Duradrakon for the last water changes. The conductivity matches the generated KH and GH. There must also be a few chlorides in it. The whole thing is also reproducible. What is stated in the dosage also produces the same values on the fourth use. I couldn't say that about the previous product. The fluctuations were sometimes as high as 200 - 300 per cent. This suggests a poor mixture. My conclusion: this allows osmosis water to be specifically hardened without immediately losing its soft water character. The pH value remains surprisingly stable even with a KH of 1-2.
29 February 2004 12:35
It offers the possibility of UO-W...
Duradrakon hardening salt
It offers the possibility of bringing UO water exactly to a suitable hardness. Water turbidity due to the hardness salt is normal and lasts approx. 15 minutes with correct filtering. A little tip: "Pre-dissolve" Duradrakon in highly carbonated mineral water and then mix with the UO water. A temperature of over 20°C is also helpful for dissolving.
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