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API GH & KH General & Carbonate Hardness Test Kit - Freshwater

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Free shippingFREE shipping on all orders over $50!(excluding orders of live fish)


When keeping freshwater fish and plants, the general hardness (GH) and carbonate hardness (KH) of aquarium water should match their natural habitat. The API® GH & KH Test Kit helps you duplicate the natural habitat of your fish to prevent stress, keeping them healthy! The kit includes 2 bottles of liquid reagent, 2 glass test tubes with snap-tight caps, and step-by-step instructions.

We recommend that you take a few minutes each week to monitor your aquarium conditions and create a better underwater world for your fish. Testing your aquarium water has never been so easy or accurate!


Includes 2 test bottles, easy-to-ready instructions, and glass test tubes.

Reviews (1)

  • 5
    Easy to use

    Posted by Stephen Basht on 10 Feb 2022

    Get product. Easy to use