Replacement Dymax CO2 Indicator Solution for the Dymax Crystal CO2 Indicator.
It is a liquid that changes color in response to the concentration of carbon dioxide (CO2) in aquarium water.
Used to monitor CO2 levels in planted aquariums, ensuring that plants have the CO2 they need to thrive.

How does it work?
The Dymax CO2 Indicator Solution contains a chemical that reacts with CO2 in water.
The color of the solution changes depending on the concentration of CO2 present.
A blue color indicates a low CO2 concentration, green indicates an appropriate CO2 concentration, and yellow indicates a high CO2 concentration.

Instructions for use:

1. Fill the glass tube with the indicator solution.
2. Attach the suction cup to the side of your aquarium.
3. Allow the solution to sit for 2-3 hours before checking the color.
4. The color of the solution will indicate the CO2 concentration in the water.

To fill the CO2 drop checker, invert it and fill the reservoir halfway with the Dymax CO2 Indicator Solution.
Then, submerge the drop checker in the aquarium water.
The color of the solution will change within 1-2 hours to indicate the CO2 concentration in the aquarium water.

How often to use it?
You should check the CO2 level in your aquarium daily with the Dymax CO2 Indicator Solution.
If the color of the solution changes, you may need to adjust the CO2 level in your aquarium.