To adapt the pH value and the carbonate hardness to the needs of the fish and invertebrates in fresh and marine water aquariums. Rapidly raises and stabilises the pH value by increasing the carbonate hardness (KH). Use in freshwater: can be used as often as needed to raise the carbonate hardness in too soft water to the desired value. Maximal increase of the pH value to 8.5. Use in saltwater: adjusts the carbonate hardness to the natural ocean value of 10 to 12 d KH and thus adjusts the required pH value of 8.0 to 8.4. Package contents: 1 bottle pH/KH booster. To use: 10 ml/40 l water. Results in an increase of approximately 1 dKH and a stable pH value.