Sera KH Test for the exact determination of the carbonate hardness in fresh or marine water. The test is sufficient for 390dKH. In a community aquarium the carbonate hardness should be between 5 and 10dkH (saltwater 8 to 12dkH) in order to guarantee sufficient pH value stabilization. Carbonate hardness stabilizes the pH value, which can fluctuate due to natural biological processes in aquariums or garden ponds. KH has a direct influence on the pH value and is crucial for its stabilization. A KH value above 5dKH ensures stable water parameters in community aquariums and ponds. This, for instance, prevents suddenly sinking pH values and creates optimal living conditions for fish, invertebrates, and plants. The sera kH-test makes it easy to determine the carbonate hardness. Sera Test KH Carbonate Hardness+ monitor the carbonate hardness (KH) in aquariums and garden ponds according to scientific standards+ allows precise adjustment of the carbonate hardness for preventing pH fluctua