A quick-release system designed to keep your room at its ideal CO2 levels for plant growth. Use the Optimum Growth CO2 System with the controller or with your existing cycle timer. Don’t have a timer? Purchase the Deluxe system, which incorporates a built-in cycle timer. Optimum Growth systems are designed to bring the PPM of CO2 to its optimal level in under 10 minutes and refill every 1.5 hours. Using the Deluxe CO2 system with the Air-3 will give your grow room its ideal CO2 levels whenever the exhaust fan isn’t running, while maintaining the proper temperature and humidity. For those who want the best, get the Pro! The Pro series regulator has breathed new life into gas control technology, giving you more value for your purchase. The Pro Regulator uses technology to protect the regulator vitals in the event of an accident by absorbing the impact using a 3-stage crumple zone in the adjusting knob. The regulator has a unique configuration that safely houses all the elements critical to system integrity.