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API GH and KH Test Kit

5 reviews 58

API (Pond Care)

Regular price $12.98

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)
Customer Reviews
5.0 Based on 5 Reviews
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United States United States
Learning Curve

Ben provides us with his years of experience - helping us to know what is necessary vs what is nice. This test kit reassures is that the water we have our koi in will help keep them strong and healthy. The kit has been easy to use because of the guidance Ben provided.

United States United States
Good to Know

I needed to know the basic water parameters of my aquarium and could not easily find a GH/KH test kit locally so found this one - ordered it and received it quickly in excellent condition as described and now I know the rest of my water parameters. Great seller.

Kerry J.
back to healthy pH

Very knowledgeable and friendly. Ben helped us get our pond back to healthy ph levels and saved our fish. Thanks guys. We’ll be back

United States United States
Works well

Works well

Dana A.
United States United States
Gh kit

Works great easy to use

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