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Each kit will give you 120 tests.

  1. Using the 5 ml syringe add 5 ml of aquarium water to the test vial.
  2. Add 5 drops of GH-1 solution to the test vial and swirl a little.
  3. Using the 1 ml syringe, place the needle firmly and draw up the GH-2 solution until the lower end of syringe's black rubber is right on the 1.00 ml mark.
    • Before this step, ensure that the needle is empty of liquids and that it's submersed in the solution the entire time to avoid air entering to the syringe.
    • The presence of a small layer of air between the liquid and the black part of syringe is normal and will not affect the result.
  4. Add 1 drop of GH-2 solution from the syringe to the test vial. The color of the tested water will change to pink       
  5. Continue adding GH-2 to the test vial one drop at a time swirling a little after each drop until the color change to navy blue       

 6. Read the position of the lower black rubber syringe. (Each division corresponds to 0.01 ml) and obtain your GH value from the GH chart.


  • The Royal GH – GENERAL HARDNESS professional test is a powerful tool and must have 120 that should be carried out weekly or any time you are concerned about the health of your fish. General Hardness is the sum of the most important minerals dissolved in the water. Water can be either ‘soft’ or ‘hard’ depending on the amount of dissolved minerals. Those dissolved minerals responsible for the hardness of the water are very essential to create the basic biological processes that occur in the aquarium. Too low hardness, these processes will not function properly. and the aquarium will enter a stress mode. Therefore, regular testing is essential to protect your fish and keep your aquarium in constant good health.

    If the the GH of your tap water is above 8 GH, then regular water changes should ensure the GH is topped up. If the GH value is low then it is crucial to check the pH and KH of the water as well.

    Recommended GH values:
    Freshwater aquarium (community aquarium): 8-25 °dGH
    Lake Malawi/Lake Tanganyika aquarium: 5-20 °dGH
    Plant aquarium with few fish: 3-10 °dGH
    Pond: 6-20 °Dgh

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