CO2 bottle method questions?!?!?

Don Gin and Ton

Don Gin and Ton

Well-Known Member
I'm thinking of adding some Co2 to my grow tent. 1.2 x 1.2 x 2m I've got a 4" fan exhausting out and a 6 inch fan in taking. I know ill need to knock these off when I fill the tent with Co2 but any one guide me on how long for?? I don't want to go overboard. the FAQ's don't really give much guidance on how often n how long.

I was thinking maybe 2 or 3 x 3Litre bottles.

how often should I be doing this ? once a week twice?? more???

any advice n guidance much appreciated !!

cheers:bigjoint:
 
Anotheroldephart

Anotheroldephart

Well-Known Member
From what I've read, i 2l bottle per week will be enough.. Put fans on timer.. I think you have 2 many fans.. Mine is a 12fx6f room and i have 2x 115cfm exhaust fans, passive intake. I run those fans continually as it takes 2.5 min to exchange air.
 
Don Gin and Ton

Don Gin and Ton

Well-Known Member
exhaust fan is running constant and the intake is timed 12/12 with the light, i only added the intake fan as my temps were too high, ( 28-29C ) its now running 24-25C.

so do i just put a 2L bottle of made up yeast/sugar/water shake and let it sit there for a week ? surely if the fans running constantly then all the Co2 is going out the exhaust?
 
Anotheroldephart

Anotheroldephart

Well-Known Member
Don Gin and Ton said:
exhaust fan is running constant and the intake is timed 12/12 with the light, i only added the intake fan as my temps were too high, ( 28-29C ) its now running 24-25C.

so do i just put a 2L bottle of made up yeast/sugar/water shake and let it sit there for a week ? surely if the fans running constantly then all the Co2 is going out the exhaust?
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Depending on the cubic size of your room, not really as co2 rises any way.. Do the math, that will determine how often the air is exchanged. Imo you don't need the intake fans, passive will do fine. Since in equals out, then that's nor what dropped temps. Leave than fan holes covered with screeninmg as critters love young tender shoots..I know...sadly..My cat's love nibbling on them...No real damage or lost.Yes, leave bottle a week..
 
Little Tommy

Little Tommy

Well-Known Member
CO2 actually is heavier than air and tends to collect at the lower part of the room. When I am running CO2, I have it dispersed above the canopy and it falls down onto the plants.
 
past times

past times

Well-Known Member
Anotheroldephart said:
Depending on the cubic size of your room, not really as co2 rises any way.. Do the math, that will determine how often the air is exchanged. Imo you don't need the intake fans, passive will do fine. Since in equals out, then that's nor what dropped temps. Leave than fan holes covered with screeninmg as critters love young tender shoots..I know...sadly..My cat's love nibbling on them...No real damage or lost.Yes, leave bottle a week..
Click to expand...
the dude already said he needs the fans to keep temps down...so he needs the fan. this will cause your soil to dry faster though so you might need to water a little extra. i have the same issue. lots of exhaust to handle my temps. because, and the fact that i have relatively small pots, i add a large mason jar of plain water in b/w my feeding schedule.

that said, CO2 is heavier then air. it will fall until caught in wind. with the co2 bottles, i always attach a hose (fish tank bubble hose) to the lids of the bottles. i have some that attach to the fan blowing under the cannopy, and i have a couple positioned right in the middle of my plants.

dont over, do the sugar on the first couple days b/c the initial reaction can be intense and cause some overflow (pain to clean and yeast cant be good floating around in grow room)...leave some air at the top too, dont fill to brim. the bottles will last about a week. you can decant off the liquid, trying to save the yeast and add more sugar water. yeast should be fine. like every 3rd or 4th water switch i add more yeast (depending how much was bumped off). I have a 3 gallon attached to the fan, and maybe 3 or 4 2 L on top of the cannopy at all times.

cheers, and dont listen to the old guy
 
B

bagadonutz

Active Member
Don Gin and Ton said:
that sounds more manageable cheers past times!
Click to expand...

I also just started the bottle method, I put two gallon jugs in my room I tried to do passive intake but my temps got a little high, so I put the intake fan on a timer to run for two hours on/ two off. I figured that I have a bit more co2 than is needed but accounting for the extra that is being exhausted out. Since it is cheap to make, I figured I could add another bottle. I have been adding co2 for two weeks and have noticed a difference in the veg cycle.
 
Don Gin and Ton

Don Gin and Ton

Well-Known Member
i was only really considering it for the flowering tent, id be interested in hearing how you get on if your doing it in your flower room
 
Anotheroldephart

Anotheroldephart

Well-Known Member
past times said:
the dude already said he needs the fans to keep temps down...so he needs the fan. this will cause your soil to dry faster though so you might need to water a little extra. i have the same issue. lots of exhaust to handle my temps. because, and the fact that i have relatively small pots, i add a large mason jar of plain water in b/w my feeding schedule.

that said, CO2 is heavier then air. it will fall until caught in wind. with the co2 bottles, i always attach a hose (fish tank bubble hose) to the lids of the bottles. i have some that attach to the fan blowing under the cannopy, and i have a couple positioned right in the middle of my plants.

dont over, do the sugar on the first couple days b/c the initial reaction can be intense and cause some overflow (pain to clean and yeast cant be good floating around in grow room)...leave some air at the top too, dont fill to brim. the bottles will last about a week. you can decant off the liquid, trying to save the yeast and add more sugar water. yeast should be fine. like every 3rd or 4th water switch i add more yeast (depending how much was bumped off). I have a 3 gallon attached to the fan, and maybe 3 or 4 2 L on top of the cannopy at all times.

cheers, and dont listen to the old guy
Click to expand...
Btw..add heat, and it rises..as with all hot air check your physics.. At 21.5c it falls..Above that temp it rises(Principles of chemistry..Keith J. Laidler). I would suggest you check facts , not opinion . oh yeah..where are the exhaust fans? Which direction do hot gases go? As cheap as sugar and yeast are, why hold it over? That decreases outflow, unless you want crappy beer..
And he shouldn't listen to you..
 
Anotheroldephart

Anotheroldephart

Well-Known Member
Don Gin and Ton said:
i was only really considering it for the flowering tent, id be interested in hearing how you get on if your doing it in your flower room
Click to expand...
The co2? That's where it's need most, as the plants are growing as a plant, and producing fruit-flowers-buds.. Since I've put mine at the bottom, the increase in bud growth was noticable in 48 hours
 
B

bagadonutz

Active Member
Anotheroldephart said:
The co2? That's where it's need most, as the plants are growing as a plant, and producing fruit-flowers-buds.. Since I've put mine at the bottom, the increase in bud growth was noticable in 48 hours
Click to expand...
I use to have an co 2 tank back in the day, I have always added co2 the whole time, I figure it only helps and it makes my root system and branch structure stronger to hold those dank heavy buds.
 
Anotheroldephart

Anotheroldephart

Well-Known Member
bagadonutz said:
I use to have an co 2 tank back in the day, I have always added co2 the whole time, I figure it only helps and it makes my root system and branch structure stronger to hold those dank heavy buds.
Click to expand...
I'm installing a full system as keeping track of the yeast/sugar bottles is messy*l*and no cheaper.. Ain't it a bitch to have to tie the branches up??? NOT!!!bongsmilie
 
CertifiedArborist

CertifiedArborist

Active Member
Anotheroldephart said:
I'm installing a full system as keeping track of the yeast/sugar bottles is messy*l*and no cheaper.. Ain't it a bitch to have to tie the branches up??? NOT!!!bongsmilie
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Best thing you can do! and everybody might want to pick up Growing with CO2. Great book and lots of good info thats needed when using co2.

if your runnng exhaust fans it would be more of a pain in the ass to do this bottle system and no real point eather. you have enough co2 to keep your plants living and healthy. Before you jump into co2 you might want to take a good look at your heat problem and the cost of co2(my CO2 setup was $150.00 and it only runs me $80 a grow, not bad!!and I dont have to mix more crap every week.)When using CO2 you want to get your room to a PPM of 1500 in 5 mins or less and I dont think these bottles could do it that fast. the book I was talking is a must read if running CO2 and theres others but thats the one I always go to when I'm messing with my system.
 
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