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 solenoid 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.

You can also get a co2 ppm kit an any hydro shop.

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.

Co2 is heavier than air, so running a co2 line from your tank to hang from your light is what i would do, but if u have a fan or something circulating air than u should have to really worry about it since co2 is only 1 1/2 times the mass of air...

Always remember when fermenting to make your co2, your bi product is alcohol, in return the alcohol, you create when the yeast breaks down the sugar kills the yeast culture. So using more yeast to make it last longer is false. Most fermenting solutions wear out in anywhere from 7 - 12 days, and thats why you use a bubble counter to monitor how much co2 is being produced.
Simply using 1 packet of champagne yeast will last longer than bakers yeast.... 90 cents at a brew shop.

Correct, also all Extra packs of yeast do is get the bottle producing max CO2 faster! the same amount of total CO2 can be achieved with lest yeast, it would just take a little longer to get it to producing at 100% output. Adding more sugar/grain etc.(Starches of any sort) can extend the life of the Wort.

Just a headsup but I noticed a bit of a problem with my Yeast/Sugar tinkering. The fan with the co2 tubing attached that I was using to blow the co2 was a bit much, the two plants closest to the fan started to show signs of excessive c02, some of the fan leaves showed necrosis due to to high a concentration of co2 and to close a proximity, was surprised at the high ppm. I didn't think that was possible from this method (not after shaking it, but hours later the c02 was still a bit high for blowing on the plants, I removed the fan and instead hooked up the bottle to my traditional c02 tubing with the tiny holes in it, I placed the bottle above my lights and the c02 now drops to the canopy via gravity rather than blown across the canopy.

PS, I also had enough of those tiny 1/4 ounce active yeast packets I bought in the grocery store, so I super-sized. Gotta love Ebay, bought a two pound brick of active Yeast for peanuts. (I made sure it wasn't anywhere near the expiration date before I decided to buy it, cause old yeast that's dead ain't no use to me

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does anyone have any exact measurements for this? does the yeast and sugar react to each other proportionally? is there any way to make it last longer by adding more sugar or yeast?

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i do not cultivate, inhale, or ingest cannabis in any form by any method. everything written on this site is a complete lie.

I tried this earlier today. So now I'm shaking every couple of hours the bottle, and tomorrow I'm gonna place it right beside the pot. I'm very curious to see any difference in the growth of my plant!!!

Cheers...

when should you start giving your plants co2 and how often?

i have my co2 bottles in my veg room cuz my flowering room has way too much airflow going to make it effective. since all the air in this place passes through the flowering room, i hope that the enrichment from the veg room will benefit the flowers at least a little bit.

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i do not cultivate, inhale, or ingest cannabis in any form by any method. everything written on this site is a complete lie.

also, i used one of those old airwick air freshener bottles, and it seems to work out for me ok after shaking and opening ever so slightly. when the pressure dies down, ill shake it again and it fizzes and creates more pressure. this cycle goes on for about 4 days or so. im thinking that this is way cheaper than excellofizz tablets or the initial investment in a co2 tank burner system.

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i do not cultivate, inhale, or ingest cannabis in any form by any method. everything written on this site is a complete lie.

C02 is heavier than air and falls.

It doesn't rise.

Kid's Science Experiment To Show That CO2 Is Heavier Than Air Video - Metacafe

Id recommend using a single 2 litre bottle for each plant, drill a hole in the top of the bottle lids and glue aquarium airline into the lid, wrap it around the top of your grow room/plants. And wa la.

Also spray your plants with Carbonated Water.

if you have a co2 tank and no regulator can you still use the tank?