CO2 pucks are just a way to separate you from your money. They don't work.
LolaGal Reviewed by LolaGal on . CO2 pucks I have a cabinet with an intake fan mounted just below the light. I was reading about the excellofizz CO2 pucks CO2 Emission Pucks. My question is, how effective would putting the pucks on the outside of the cabinet right by the intake fan be? I was thinking the CO2 would be blown in and able to drop down on my plants, but at the same time, I'm not sure if it wouldn't be better to mount something on the inside of the cabinet. The reason I'd rather not do the latter is to maximize grow Rating: 5