The Dymax CO2 Bubble Counter is designed for both planted & reef aquariums. For the planted aquarium, it is used to gauge the amount of CO2 applied to the plants as a fertiliser for optimum growth. For the reef aquarium, it is used if a calcium reactor is in place, to monitor the amount of CO2 applied so as to dissolve calcium in the water. The Dymax CO2 Bubble Counter provides an accurate reading of CO2 with its well designed structure and the durability of material used, to help you succeed with your aquarium.