The CO2 Indicator is designed to indicate the amount of CO2 that is dissolved in the water. The level of CO2 in your aquarium is indicated by the colour of the test solution within the sphere. This is important because too much CO2 is toxic to the fish and too little will limit the plant growth
Open the plastic sphere and take care not to loose the green ball
Drop 15ml (15 drops) of the monitoring solution into the front cover.
Close the plastic sphere and attach the suction cup
Place vertically into the aquarium with the indicator ball at the top
Replace indicating solution after 30 days.
Blue – CO2 level is low
Green – CO2 level is OK
Yellow – CO2 level is too high