Dry Ice

[Lashdog]

Has anyone used dry ice to increase the CO2 in your grow?

[FunkyButtLovin]

Nope, it would be a huge waste of money.

[MeestaFeesha]

I recall reading in Rosenthal's book that they used to add Co2 to dark rooms (while they were inside and holding their breath!). I believe in the scale that we are (assumption) growing air exchange is enough.

[smoorman]

I can buy dry ice cheaper than compressed CO2 per pound. I leave it in a closed cooler and then place it in a a garbage bag. And then another garbage bag oriented the opposite direction. The bags inflate as the ice vaporizes. Lasts several days. I may try it again and go to some lengths to seal the cooler and increase the pressure in the cooler and hence extend the vaporization period. Plus I was using 1/2"x1.5" cylinders of ice. If I could get it in block form the results should improve significantly.

[Kmhubb]

Not to hijack your thread but I was reading about getting bugs on your plants inside the house & it came across my mind that maybe you could kill the bugs if you flooded the room with CO2. However I don't know if the plants can handle that much CO2 or not. Your post got me wondering about that again.

[Rwise]

A Quart of water, 2 tablespoons of sugar, and a pinch of (any brand) yeast will make CO2, but you breathing in the home is enuf for our girls.

[keldog420]

good air exchange is 400ppm .. if your room is hot or extra hi par levels 1000ppm is what u want .if both 1400ppm of co2 and only when lights are on..

[Cali]

As long as you don’t seal the dry ice completely I would say go ahead and experiment. One thing if you seal dry ice in a coke bottle the pressure will make it blow up and is as dangerous and loud as an M-80 firecracker something to keep in mind.