CO2 Indicator solution, easy and convenient to use without the need for aquarium water.
Use with Glass CO2 Checker.
Volume: 15ml per bottle
1) Put 15 drops of CO2 Indicator Liquid into the CO2 Checker. Do not add in any water.
2) Place inside your aquarium, observe the indicator colour.
3) Compare the colour to know the CO2 level content in your aquarium.
4) Recommend changing CO2 Indicator Liquid in checker every 30days.