The Colombo indicator permanently indicates the CO2 level in the water of your aquarium
  .

Just place the indicator in your aquarium and the color of the indicator liquid will give you the CO2 level in the water.

This kit includes enough liquid to operate for 2 years.

 Notice:

Fill the part of the drop checker to this effect for this purpose, drop by drop with the "CO2 test" product.

Place the drop check in the aquarium (about 5cm below the surface of the water) so that the product does not escape in the aquarium.

The reactive product will color within 24 hours and indicate the CO2 content of the water from the aquarium.

Content:

1. Green: Optimal content: 15 / 25mg / L

2. Blue: Low content: less than 10mg/L

3. Yellow: too high content: greater than 30mg/l