CO2 night cut-off valve

Professional tip

For magnificent plant growth, DENNERLE recommends a CO2 content in the aquarium of approx. 20 mg/l.

As certain correlations apply between CO2 content, carbonate hardness (CH) and pH value, the CO2 content in the water can be calculated according to a simple procedure:

  • Measure the carbonate hardness of your aquarium water.
  • Read the pH value which corresponds to the desired CO2 content from the table. You should set this pH value +/- 0.1 by adjusting the number of bubbles accordingly. Example: Carbonate hardness 4 °d, recommended pH 6.8 +/- 0.1.
  • The procedure is even simpler with the DENNERLE CO2 long-term test Correct + pH.