Tropic Marin KH/Alkalinity Test PROFESSIONAL Test

Measuring range: 0.1 - 20 °dH

Resolution (accuracy): 0.1 °dH

The carbonate hardness (KH)* or alkalinity* of a water sample characterizes its buffering capacity, i.e., its ability to maintain the pH value of the water. It is primarily determined by the proportion of bicarbonate ions in the water. As the pH value increases, other basic ions, such as hydroxide ions, also contribute to the alkalinity.
Carbonate hardness should be checked regularly in all aquariums. If the alkalinity in the aquarium is too low, it can lead to a life-threatening drop in pH (acid crash) for many fish and invertebrates. In reef aquariums, sufficient carbonate hardness is essential for strong coral growth. Conversely, excessively high carbonate hardness in saltwater tanks can lead to calcium carbonate deposits and also negatively affect coral growth.
*In water chemistry, several terms exist to describe buffering capacity, each with different definitions. In aquariums, the term "carbonate hardness" is commonly used; however, alkalinity is actually measured. In this test, both terms are used interchangeably.
Carbonate hardness is usually given in degrees of German hardness (°dH). A conversion table to other common units (such as the equivalent unit millivals per liter (mval/l) or the amount of substance in mmol/l) can be found on the cover.
In the oceans, the carbonate hardness is around 6.5 °dH. In a saltwater aquarium, the carbonate hardness should be between 6 and 9 °dH. In freshwater aquariums, the carbonate hardness should not fall below 3 °dH. The optimal alkalinity value for a freshwater aquarium depends on the fish and plant species being kept. Ask your local aquarium shop about the correct carbonate hardness for your tank.


10 ml of reagent A
50 ml Reagent B
1 glass cuvette 10 ml
1 dosing syringe 5 ml
1 dosing syringe 1 ml with attachment
1. Instructions for use

Safety instructions:

Danger

H226

P102 P210