Active Air-Timer Options:Hydrofarm CO2 (1-20 cu ft per hour) with Timer Premium aluminum European Hammertone interior:

Premium aluminum European Hammertone interior: 99

You can use enzymes to flush or add them to the nutrient solution throughout the grow cycle

to automatic

Digital and Passive T Outputs

Active Air-Timer Options:Hydrofarm CO2 (1-20 cu ft per hour) with Timer Premium aluminum European Hammertone interior:Deliver growth boosting CO2 with our user friendly, easy to operate system. With its programmable timer, it will automatically maintain ideal CO2 levels for optimum growth. For small to medium size areas, select the COSYS; for larger than 10' x 10' areas, select the COSYS20. To use Hydrofarm's CO2 Flow Rate Calculator, click HERE NOTE: Current COSYS & COSYS20 now come equipped with a black rubber O ring that has replaced the white plastic washer.