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JBL KH Test JBL KH Test – Quick test to determine the carbonate hardness in freshwater and saltwater aquariums and ponds, KH Test. The right water values are dependent on the fish stock and the plants in the aquarium/pond. Even if the water looks clear it can be contaminated. With bad values diseases or algae can also appear in the aquarium/pond. To maintain a healthy aquarium/pond with conditions close to nature it is important to check and adapt the water values regularly. For each water analysis JBL provides water tests in the form of quick tests or colour change tests. These determine a certain value or several values in one go. With these water tests you can recognise algae problems and also negative nitrate, nitrite, potassium, magnesium values etc. Simple and reliable control of water values in aquariums and ponds. Determination of the optimal carbonate hardness for freshwater and saltwater Colour change test: Fill plastic cuvette with water sample then add reagent drop by drop until colour changes from blue to yellow. Number of drops = level of carbonate hardness When to use: when setting up a new aquarium: once a week Package contents: 1 quick test, KH Test. Incl. reagent and plastic vial. Refill reagent also available separately Recommended pH values: Freshwater aquarium (community aquarium): 5-12 °dKH Lake Malawi/Lake Tanganyika aquarium: 7-20 °dKH Plant aquarium with few fish (aquascaping): 3-8 °dKH Marine aquarium: 7-10 °dKH Pond: 7-10 °dKH You may also purchase the JBL KH Test Refill separatley. Click here to also browse a wide range of Aquarium Test Kits we stock!