The CO₂ Basic Set provides an easy way to add CO₂ to small aquariums. Fill the diffuser with CO2 and contact with the water absorbs the CO₂ gas. Handy CO₂ basic set for small aquariums, ready to use in minutes. Check the CO₂ content of the aquarium water with the CO₂ indicator. Order refill bottles so you can continue dosing CO₂ inexpensively when the first bottle is empty.
