The carbonate hardness (KH) or alkalinity* of a water sample characterizes the buffering capacity, i.e. the ability to maintain the pH value of the water.
Alkalinity (kh) is defined by the proportion of hydrogen carbonate ions in the water; other basic ions such as the hydroxide ions also contribute to the alkalinity as the pH increases. The alkalinity should be tested in all aquariums regularly. If the alkalinity in the aquarium is too low, the pH value can sink (sudden drop in acidity) to a level which is life-threatening for many fish and invertebrates. In reef aquariums, an adequate alkalinity is essential for strong coral growth. On the other hand, a very high alkalinity in saltwater tanks can lead to lime precipitates and also have a negative impact on coral growth.
Natural seawater has an alkalinity of 6.5 °dKH. The alkalinity in saltwater aquariums should range from 6 to 9 °dKH. To increase the alkalinity when levels are too low, we recommend using Balling Salts Carbonate or Elementals KH. Ask your specialist retailer for the correct alkalinity for your tank.
Contents of package:
- 10 ml / 0.34 fl.oz. of reagent A
- 50 ml / 1.69 fl.oz. of reagent B
- 1 glass cuvette 10 ml
- 1 dosing syringe 5 ml
- 1 dosing syringe 1 ml with dropper tip
- 1 instruction for use
In order to protect the environment, the reagents for this Test Kit (KH/Alkalinity) are available in affordable refill packs!
*There are many terms in water chemistry to describe the buffering capacity with varying definitions. The term “carbonate hardness” is customary in reef- and fishkeeping; however, it is the alkalinity which is measured. In this test, both terms are used synonymously. The reading for alkalinity is usually given in degrees of German hardness (°dKH). You can find a table for converting this unit into other common units (such as the equivalence unit millival per litre (mval/l) or the volume of substance in mmol/l) on the second cover page.