Berechne den tatsächlichen gelösten CO2-Gehalt aus pH- und KH-Werten des Aquariums. Prüfe, ob die CO2-Injektion im idealen Bereich von 15–30 ppm liegt.
The formula is: CO2 (ppm) = 3 × KH (°dKH) × 10^(7 − pH). This is derived from the carbonic acid equilibrium in freshwater. Higher pH or lower KH means less dissolved CO2. The formula assumes a closed system with no other acids present.
The ideal range is 15–30 ppm. Below 15 ppm, plants may not grow well. Above 30 ppm, fish can show signs of stress such as gasping at the surface. Monitor fish behavior and adjust CO2 injection accordingly.
KH (carbonate hardness) is measured with a standard API KH test kit or digital meter. It is expressed in °dKH (German degrees) or ppm CaCO3. 1 °dKH = 17.848 ppm CaCO3.
Tap water, organic decomposition, fish respiration, and substrate all contribute to CO2. Even without injection, tanks typically have 2–5 ppm of dissolved CO2. This calculator shows what is currently dissolved, not what you've injected.
No. Saltwater chemistry is more complex due to borate alkalinity. This formula applies only to freshwater tanks. For saltwater CO2 estimation, use a dedicated reef chemistry calculator.