What is carbonate hardness (KH or CH), and how do I test for it?


Carbonate hardness is a measure of carbonates and bicarbonates dissolved in water. It refers to the ‘buffering’ ability of the water, which is how the water maintains a stable environment for aquatic life.

To determine carbonate hardness you need to measure total alkalinity. This can be done using a photometer and Palintest Alkalinity tablets, known as Alkaphot (AP188). Visual methods to measure total alkalinity are also available.


Currently the contact form is under maintenance, please use the below contact details to speak to your local Palintest branch where a member of the team will be happy to assist.

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