sera guide - Marine aquariums

47 Carbonate hardness (KH) The carbonate hardness (KH) in the water serves as a buffer. It is able to neutralize acids and therefore absorbs small fluctua- tions of the pH value. In order to provide a buffering effect that is strong enough for a marine aquarium, the carbonate hardness must not fall below 8°dKH. You can quickly and precisely check the car- bonate hardness with the sera kH-Test. Increasing the KH level is easy and safe with sera KH/pH-plus. kH acidic neutral alkaline 5 6 7 8 9 10 11 8 8,5 marine water KKHH iinnccrreeaassee