Active Air-Timer nutrient-combo Choose this ballast for its

Choose this ballast for its versatile 120V/240V capability (120V cord included

” and trust that your machine will run the way you want it to

Nature's Pride fertilizer incorporates this ancient knowledge into every bucket to bring the secrets of the Amazon directly to your garden

- Can shut off another equipment while CO2 enrichment is ON

Bug & pathogen free

Active Air-Timer nutrient-combo Choose this ballast for itsDeliver 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.