Healthy plant growth requires precise control of CO2 supply. With our 15 ml refill liquid for CO2 permanent tests, you can be sure that your plants are optimally supplied without endangering your aquarium inhabitants. The solution is ready to use and universally suitable for all common glass or plastic permanent tests.

Advantages of our indicator liquid:

• Economical 15 ml bottle: Quality doesn't have to be expensive. One bottle is enough for at least two complete fillings for standard permanent test vessels.
• Intuitive color scale: The indicator reacts precisely to the CO2 content in your aquarium water and shows you the current status with a clear color change:
  • BLUE: Too little CO2 – Fertilization should be slightly increased.
  • GREEN: Optimal CO2 level – Perfect conditions for plants and animals.
  • YELLOW: Too much CO2 – Caution! Reduce CO2 supply, danger to inhabitants.
• Ready to use immediately: You do not need to mix the solution with aquarium water. It is already set to the correct carbonate hardness to provide an unadulterated result.

Application:

Empty and thoroughly clean your permanent test. Fill approx. 1.5 to 2 ml of the indicator liquid into the vessel and place the test in the aquarium as usual. After approx. 1-2 hours, the color will have stabilized and will show the correct value.