keep the bottle top even with your plant bases this way the gas will 'flow' out across your grow container tops, over the stems and leaves and minimizes spills into your plants.

i know dark place is necessary for fermentation, so we can cover the bottle with t-shirt or something like that, i guess it is working without but when we cover must be better

Just so you know, making your own co2 is fine and all for 1 - 4 plants... but if you plan on going bigger, for around 55$ u can get a 5 lb co2 tank already filled, then all u need is a regulator(25$) and a co2 bubble counter(5$) On ebay they do sell electric cylinoid co2 regulators with a bubble counter built in(65$) so that you can hook it up to a timer. All this for around or under 100$.

Go check your local beer brewery shops, they have more co2 than they can sell and its cheaper than making it yourself.

For those who want more, pick up a 20lb tank for only 150$ - 185$ and it should only be around or under 1$ per lb of co2 you buy.

When using a co2 tank you can do really cool stuff like throwing a co2 reactor into your hydro system, and if you are using a drip system or hydro buckets, you can fuse the co2 lines into your air lines and mix co2 into the water as well as distro through the drip sytem. Growing can be alot of fun if you keep it simple.

I found this,


Temperature, humidity, and CO2 concentrations form a triangular relationship in a greenhouse or indoor grow. If all 3 factors are not in equilibrium, there is a risk to the plant in terms of stunted growth, toxicity, or death/disease.
Studies have shown optimal growth and yields at 90-95°F, 1,500 ppm CO2, 45-50% relative humidity, 7,500-10,000 lumens/square foot of light, and vigorous air movement both above and below the canopy. CO2 enrichment under 80°F, under 7500 lumens/sf, or above 50% humidity is not recommended because plants will not be conducting photosynthesis quickly enough to benefit from the enrichment.

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I'm still a newbie just starting my first grow but you may want to check this out with some of the pro's here. From my understanding, CO2 can only be absorbed by the leaves. The roots need oxygen. Introduction of CO2 to the root system may harm the plants.

I may be wrong and apologize if I am

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Semper in excretia, solon profundum variat!

Make sure that wherever you put your CO2 bottle, that it be above the plants. CO2 is heavier than air and will "float" downward.

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MMMM.......Sweet Tennessee Danky Dank
http://www.rollitup.org/grow-journal...irst-grow.html

That's my view as well, CO2 in the water becomes toxic to the plant.

Sounds good.Good timing on how to make co2 at home. What really does this do to the plants. Whiz Bang.

What about using tubing to connect to the inlet duct?

If the air is being extracted at the top (hot air rises) the CO2 will definitely come up from the bottom.. just a thought.