Carbonate Hardness test for fresh water and marine water aquarium

Carbonate Hardness test for fresh water and marine water aquarium. Carbonate Hardness is synonymous with Alkalinity. The acronym “KH” comes from the german “Karbonathärte” which means Carbonate Hardness. The test works as an indicator of the stability of the pH, then higher is the KH, greater is the pH stability in the aquarium.

Feeding Guide

- Collect the aquarium water to be analyzed, filling the test tube up to mark 1 or to mark 2 (for a greater test accuracy).
- Keeping the reagent bottle in a vertical position, drop the reactive solution drop by drop, shaking the test tube after adding each drop and observing the color that comes up.
- During application, a pale green color will be initially observed, which will intensify till it turns red. At this time, record the number of drops used.
- For samples at mark 1, one drop corresponds to 1 degree °dH.
- For samples at mark 2, two drops correspond to 1 degree °dH.


Interpretation of test result:
The acceptable values of KH vary according to the type of aquarium:
- Plant aquarium: KH between 3.5 °dH and 8.0 °dH with pH between 6.8 and 7.0.
- Aquarium with plants and fish: KH between 2.0 °dH and 6.0 °dH with pH between 6.8 and 7.4.
- Marine aquarium: KH between 6.5 °dH and 12.0 °dH with pH between 8.2 and 8.3.

Recommendations:
- For the accuracy of the result, it is essential to maintain the same size between the drops, therefore, the importance of carrying out the test keeping the reagent bottle in a vertical position.
- To guarantee the effectiveness of the tests, keep the reagent bottle tightly closed.
- After each test, clean the test tube and keep it capped.

Ingredients

Bromocresol green, methyl red, ethyl alcohol, hydrochloric acid, filtered water

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