correction - optimal fermentation of 1lb of sugar a week produces 125,413,359,750 times as many molecules of CO2 per minute compared to hamster respiration. Here is a useful question. I would be interested in hearing what the concentration of CO2 you (past times) are getting in your 48 cubic ft closet grow(assuming 2x3x8ft tall, can't figure out mathematically due to room exhaust) (some guys are using meters/sensors with their tanks as they should be) vs what conc the tank guys are trying to achieve.
Past times - are you using sog or scrog in your closet or some other method. If you like beer you could two birds with one stone (though your limited space would prob prevent having car boys in the closet

that is what i have been trying to figure out. dont have a meter though and really dont want to buy one. with the co2 tank, if you truely have 20 lbs of co2 in the tank then you have about 189 moles co2... thats compared to the 30 moles produced by the 5 lbs sugar. talking to people, they said a tank lasts about a month. so with my system i am making 1/6 the amount of co2 in twice as much time. (I did all of this stuff stoned though, so i might be off, but looked through it a couple times and think it is right)

as far as my grow, i veg about 5-6 weeks, topping after about 4 or 5 weeks when they are 9 inches tall. after the top i let them recover then flower. i guess you can say i lollipop my plants. i am pretty aggresive with pruning taking aff all bottom shoots on the bottom foot of the plant. this usually gives me about 1 foot of buds on top (each plant having 6 colas at about the same lvl). i do this because of my relatively small light. as far a ventilation goes i have a pc intake coming through a wall that shoots the incoming air just over the soil lvl. i also have a bathroom fan with a carbon filter pulling air out through the ceiling. i wish i had pics but that is a no go.

the thing about my room is i have plenty of height. and it just so happens that i have a few feet on the bottom to slip a 5 gallon carboy. only problem is bottling the damn beer...just takes too long. not to mention i would produce 5 gallons of beer a week.

lol i DOUBT the hamster even puts out an 8th of the Co2 you put out lol

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178 hours of co2 when using setting 4 in a 56 cubic feet room = 20 pounds

oh and its 11.50 to refill at your local welding shop

So what have we decided is the best CO2 method?

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FUCK RIU

I am not a biologist, but I did fail it 3 times... Anyway, those tiny rodent lungs won't make co2 fast enough to use it during the hot "sunny" day, plus you'd have to capture it efficiently. There's already living creatures in the house to exhale shitloads of co2... SO, I am thinking we could make a "mask" to wear at night which will connect to a long ass tube leading to a bigass garbage bag in the basement... Then we just pull it into the grow room even while venting, and we'll still have shitloads of co2 as it just gets replenished during the night when we sleep. How about it? Let us brainstorm some ideas to cleverly attach a tube collection device to one's mouth for night time...

Fuck a hamster, try a 3 toed sloth.

a small mammal of that size will make no difference.on full grown cannabis plants. no difference and besides you have to vent anyway. maybe enough co2 for a sprout in a shoe box but thats it

do mammals actually produce c02 i thought it is simply inhaled with the other gasses nitrogen and oxygen and then exhaled because the body doesnt use c02. so this would change the ratio of oxygen nitrogen and carbon dioxide but not necesarily raise c02 levels unless there is a process that takes place that creates more c02 in the body during resperation meaning more was exhaled than inhaled. is anyone familiar with how this process actually works is c02 created in the body or is oxygen simply removed making the c02 ratio higher in the exhaled breath? as far as best c02 system thats simple c02 tank and regulator. i worked in aquaria most of the fermentation devices work ok but only for small areas if it is a big grow or aquarium a tank and regulator will be required for best results

used up oxygen is converted to Carbon (which we ar made ) and oxygen (which we are breathing in) when we breathe it in our lung combusted the gas down and we use it up and what left over is the end effect of our carbon and oxygen mixing CO2