Home » shop » NT Labs Hardness Test Kit, Meares General Hardness (GH) and Carbonate Hardness (KH), Aquarium Water Test Kit, Pond Water Testing Kit, Contains Up to 80 Freshwater Tests.
NT Labs Hardness Test Kit, Meares General Hardness (GH) and Carbonate Hardness (KH), Aquarium Water Test Kit, Pond Water Testing Kit, Contains Up to 80 Freshwater Tests.
NT Labs Hardness Test Kit, Meares General Hardness (GH) and Carbonate Hardness (KH), Aquarium Water Test Kit, Pond Water Testing Kit, Contains Up to 80 Freshwater Tests. - Image 2
NT Labs Hardness Test Kit, Meares General Hardness (GH) and Carbonate Hardness (KH), Aquarium Water Test Kit, Pond Water Testing Kit, Contains Up to 80 Freshwater Tests. - Image 3
NT Labs Hardness Test Kit, Meares General Hardness (GH) and Carbonate Hardness (KH), Aquarium Water Test Kit, Pond Water Testing Kit, Contains Up to 80 Freshwater Tests. - Image 4
NT Labs Hardness Test Kit, Meares General Hardness (GH) and Carbonate Hardness (KH), Aquarium Water Test Kit, Pond Water Testing Kit, Contains Up to 80 Freshwater Tests. - Image 5
NT Labs Hardness Test Kit, Meares General Hardness (GH) and Carbonate Hardness (KH), Aquarium Water Test Kit, Pond Water Testing Kit, Contains Up to 80 Freshwater Tests. - Image 6

NT Labs Hardness Test Kit, Meares General Hardness (GH) and Carbonate Hardness (KH), Aquarium Water Test Kit, Pond Water Testing Kit, Contains Up to 80 Freshwater Tests.

£9.49 (as of 04/05/2026 16:17 PST - DetailsProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

KH, also known as “total alkalinity” or “carbonate hardness”, is a measure of the buffering capacity of the water in your aquarium/pond. The buffering capacity refers to how well it can resist changes in pH.

SKU: B084Q63Q42 Category:
  • 【 MONITORS KH IN AQUARIUM AND POND WATER】: KH, also known as “total alkalinity” or “carbonate hardness”, is a measure of the buffering capacity of the water in your aquarium/pond. The buffering capacity refers to how well it can resist changes in pH.
  • 【 MONITORS GH IN AQUARIUM AND POND WATER】: General Hardness is a measure of the total amount of minerals dissolved in the water. Water hardness lies on a spectrum between ‘soft water’ or ‘hard water’ depending on the amount of dissolved minerals: the more minerals present, the greater the hardness. Hard water is responsible for the build-up of limescale.
  • 【 EASY TO USE 2 IN 1 TEST KIT】: Ensure the test tubes are clean. Take a 5ml sample of water into each test tube and them follow the pictorial instructions on the box.
  • 【 WHAT IS THE IDEAL GH VALUE 】: This test kit measures GH in dGH (where one degree = 17.8 ppm as CaCO3). The correct GH depends on the type of fish being kept. For soft water species, aim for a GH of around 3 to 6 dGH, while for hard water species, 10 to 15 dGH is the correct range.
  • 【 WHAT IS THE IDEAL KH VALUE 】: This test kit measures KH in dKH (where one dKH = 17.8 ppm as CaCO3). It is essential to maintain a minimum KH level of at least 4 dKH at all times. A KH of between 6 and 8 dKH is more desirable.

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