NTLABS GH/KH Hardness Test Kit

KH, also known as “total alkalinity” or “carbonate hardness”, is a measure of the buffering capacity of the water in your pond. The buffering capacity refers to how well it can resist changes in pH.

General Hardness is a measure of the total amount of minerals dissolved in the water. Water hardness lies on a spectrum between ‘soft water’ or ‘hard water’ depending on the amount of dissolved minerals: the more minerals present, the greater the hardness. Hard water is responsible for the build-up of limescale.

This test kit measures KH in dKH (where one dKH = 17.8 ppm as CaCO3). It is essential to maintain a minimum KH level of at least 4 dKH at all times. A KH of between 6 and 8 dKH is more desirable.