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.
Why is the black solenoid on my CO2 regulator getting hot?
This is normal, the maximum operating temperature of this unit is 80C/176F. Do not touch the solenoid while the unit is operating.