The Fluval A7547 is perfect to keep your aquarium with lush and vibrant floral growth. This Fluval CO2 kit has three cartiridges of CO2, which can be used for aquariums up to 40 gallons, dispenses one buble per second. This 88 g catridge CO2 kit is easy to install and can be replaced for a continuous supply of CO2 to your aquarium. Providing optimal quantity of CO2 to your plants, this Fluval CO2 kit is made specially for good plant growth.