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. Tip: KH can strongly influence pH. If you add a pH adjuster to your aquarium and the pH returns to its original level in a day or two, this is called "pH rebund" -and it is caused by high KH. Very hard water can cause an ugly white crust (scale) to form on the hood, on glass walls, and on other parts of the aquarium. Kit contains 2 bottles of liquid reagent, 2 glass test tubes with snap-tight caps, step by step instructions and information on how to correct unsafe conditions. Liquid test for freshwater Helps detect stress on fish caused by rapid pH shifts, the result of low KH levels. Contains clear instructions. Tests tap water & freshwater aquariums for general hardness (GH) and carbonate hardness (KH). Helps prevent fish stress caused by rapid pH shifts, the result of low levels of KH. and glass tube(s) Liquid test for freshwater Helps detect stress on fish caused by rapid pH shifts, the result of low KH levels Contains clear instructions and glass tube(s) Documentation API GH and KH Test Kit — Spec Sheet — 798f301aeaedddcd24c5543c9b80147ca5681ec7 (PDF) API GH and KH Test Kit — Spec Sheet — 9110cf044814fe4851d035005b1ea0afe0ef5cf1 (PDF) Product Video
