API Test Kit General & Carbonate Hardness GH/KH

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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! Contains 2 test bottles, easy-to-ready instructions, and glass test tubes. Show more