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API GH General & KH Carbonate Hardness Test Kit - Freshwater

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AU $32.00
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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. 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.