Active Air-Timer Size:Hydrofarm CO2 (1-20 cu ft per hour) with Timer King Kola® also contains yield-boosting

King Kola® also contains yield-boosting nitrogen derived from hemp seed flour

House & Garden Roots® Excelurator Silver is the classic formula that is compatible in hydroponic and recirculating systems

SIPCO perfected a proprietary formula to help plants reach their full genetic potential

bacterial leaf blights

Active Air-Timer Size:Hydrofarm CO2 (1-20 cu ft per hour) with Timer King Kola® also contains yield-boostingDeliver 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.