ADA’s standard CO₂ supply kit, CO₂ Advanced System, has been redesigned to give you an affordable package with CO₂ System 74/Ver.2 and all the essentials. CO₂ ADVANCED SYSTEM – FOREST is compact, containing Pollen Glass EZ, a new quality glass CO₂ diffuser with built-in bubble counter. In addition, for its attractive appearance, the kit comes with a metal stand for CO₂ cylinder, instead of the Cap Stand. ADVANCED SYSTEM – FOREST is a perfect CO₂ supply kit for beginners with the aquarium tank 60 cm in width or smaller.