?Easy To Operate?Easy to set up,the bottle must be carbonated beverage bottle, do not use pulpy, green tea, mineral water bottles, etc ?Note?100% Brand new and high quality,trimming valve regulation avoid by sudden big or small, can't suddenly turn up, after immediately shut down again, so as not to cause abnormal pressure to the bottle ?Tube Length?CO2 Tube Length: Approx. 1.6m / 5.2ft ?Designed For?CO2 system is designed for low cost planted tank use ?Principle Of Operation?According to the pressure principle, push the acid liquid into the small soda liquid, then the two liquids reacting to produce continuous PURE carbon dioxide.