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KH - Alkalinity



In a marine aquarium, the alkalinity should be between 7° and 10° dKH (German carbonate hardness), whereas in a fresh water aquarium, it should never drop below 3°dKH.


Alkalinity is a measure of the concentration of various negatively charged ionic compounds (anions) such as carbonates, bicarbonates, borate and hydroxides in the aquarium water and is a means of quantifying the stability of pH in a solution.


If the alkalinity drops below a critical level, the pH begins to fluctuate more than is acceptable (a daily pH shift of +/-0.2 is normal in marine aquaria), and can stress livestock. Because of this importance, it is necessary to keep the proper KH level by testing it with an accurate test kit. 


Elos AquaTest KH makes it possible to quickly determine the buffering capacity of your aquarium water. It is a high quality product with a high degree of accuracy thanks to the laboratory grade calibrated droppers and NIST (National Institute of Standard and Technology) certification. 


  • High precision: thanks to the use of calibrated droppers
  • NIST validation: each batch is validated using NIST (National Institute of Standard and Technology) samples.
  • High number of test per kit: up to 60 test (with a standard level of 10 dKH)
  • "Safe reagents": reagents and testing procedures are based on Low Risk Reagents. None of our test kits are based on Toxic Reagents.


ELOS AquaTest KH, as well as all the other titrimetric test kits of this line will grant very high precision thanks to several procedures like the use of calibrated droppers with constant and predefined drops of 0.05 ml each, the validation of our reagents through NIST (National Institure of Standard and Technology) validation and the careful stock management to supply to our customers ONLY the freshest production batch.

KH - Alkalinity

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