Carbonate hardness (KH) stabilizes the pH value.

*Biological degradation process and carbon dioxide consumption by the plants in an aquarium alter its buffering capacity. A low carbonate hardness (below 5dkH) causes strong pH fluctuations (acid drop!). In community aquariums， KH value between 5 and 10dkH ensure a stable pH and vigorous plant growth. Malawi and Tanganyikan cichldids prefer higher KH values from 8-12dkH.

*Makes it easy to monitor the carbonate hardness in fresh and salt water.

*For approx. 390?dKH. In case of too low KH values we recommend sera KH/pH-plus (in fresh and marine water) or sera pond bio balance (in ponds)， in case of too high values we recommend filtering through sera super peat (in freshwater aquariums).