CO2 pucks

[willonia]

I have a cabinet with an intake fan mounted just below the light. I was reading about the excellofizz CO2 pucks CO2 Emission Pucks (http://www.4hydroponics.com/grow_room/co2excellofizz.asp). 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 space. Any thoughts?

[cannakeeper]

I have never heard if this stuff. Sounds like a high priced alka-seltzer to me. Search for some unbiased trials on it. For the price of that shit you could prob find an emitter on egay and lease a small Co2 tank from a local welding or a restaurant supply for a little more than a box of that shit. I personally would just get the tank and use a "hillbilly" emitter(ur wrist) if $$$ is a serious prob, before buying anything like that. Maybe someone else has posative personal exp with it that might shed some light on it for you. I'm just weary of "gimmicks" Those ppm claims seem exaggerated to me, I would think that if it were as simple as a tab then it would be the talk throughout the entire canna nation and no need for tanks. Maybe it is and i've just been left "out or the loop"

[frostymcfailure]

. In a 12' x 12' foot room, it will bring the CO2 level up to 1600ppm for a good part of a day. im kinda doubting that too. i have a hunch that if you put a cup of 100ml of water in a room 2x2 or 1000X1000 and drop that puck in it and measure the ppm an inch above the water level it may be "1600ppm for a good part of a day". Pretty doosch to advertise it in such a way but thats advertising.

[LolaGal]

CO2 pucks are just a way to separate you from your money. They don't work.