Active Air-Timer Options:Hydrofarm CO2 (1-20 cu ft per hour) with Timer Comes in a heavy-duty

Comes in a heavy-duty

to automatic

The microbes contained in SOS will promote stronger and faster root

waterproof casing

This de-ionization filter is designed to serve as a post

Active Air-Timer Options:Hydrofarm CO2 (1-20 cu ft per hour) with Timer Comes in a heavy-dutyDeliver 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.