CHIHIROS - CO2 Indicator Tiny or Hanging Type for Aquarium Aquascape and Liquid Refill
If you need a bottle of CO2 indicator reagent liquid (without mixing aquarium water). Please purchase separately by choosing the option. Instructions: 1) Put 15 drops of CO2 Indicator Liquid into CO2 Checker. Do not add in any water. 2) Hang on your aquarium, make sure the opening of CO2 indicator go into at least 1cm of water surface. Observe the change in indicator colour. 3) Compare the colour to know the CO2 content level in the aquarium. 4) Recommended changing CO2 Indicator Liquid in checker every 30 days. Blue - Insufficient CO2 Green - Sufficient CO2 Yellow - Too Much CO2
Indicator Tiny, Indicator Hanging, CO2 Indicator Liquid