Active Air-Timer Size:Hydrofarm CO2 (1-20 cu ft per hour) with Timer high-pressure sodium lamps with ceramic

high-pressure sodium lamps with ceramic discharge tubes for high efficiency and efficacy with optimum lifetime performance

and resin production in your plants

Replace every 10

chloramine

bacterial leaf blights

Active Air-Timer Size:Hydrofarm CO2 (1-20 cu ft per hour) with Timer high-pressure sodium lamps with ceramicDeliver 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.