Note: We can not ship this Test Kit expedited or to Hawaii, Alaska or Puerto Rico

Water hardness is a measure of the dissolved mineral content of water. There are two types: the general hardness (GH) and carbonate hardness (KH).

When keeping freshwater fish and plants, the GH and the KH of aquarium water should match their natural habitat. The GH & KH TEST KIT helps aquarists duplicate the natural habitat of their fish, as well as detect low KH levels, which can lead to rapid and wide pH shifts, stressing fish.

Includes everything you need to measure the general and carbonate hardness of your aquarium water.