yup another CO2 question.

OK Guys, I think I'm gonna step up my game and bring CO2 into the mix. I already got everything i need ( 10 lb tank, regulator, hose, etc) my question is would it be better for me to turn off the intake fans and run the hoses up to the plants while CO2 are being released or just run the tube to the intake fans and keep them on?!?!?!?

Yes you have to let the Co2 sacherate, if you leave the fans on it will vent out.

well, wouldnt it be ok because during that time my hood wont be on.. thanks for the reply!

If its connected to a hood or cooltube you should be fine

Best method for C02 would be to turn off all exhaust and intake fans, c02 is heavier than air so you want to release it over the tops of your plants, and give it time to saturate, most growers limit there saturation time to how long they can maintain decent temps, this is why you here a lot of growers saying you can have higher temps with C02.

BCtrippin said:

Best method for C02 would be to turn off all exhaust and intake fans, c02 is heavier than air so you want to release it over the tops of your plants, and give it time to saturate, most growers limit there saturation time to how long they can maintain decent temps, this is why you here a lot of growers saying you can have higher temps with C02.

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The way my setup is, my fans are on a dual timer set for 4 times a day at 20 minute intervals My Co2 is set up on a timer for 4 times a day at 5 minute intervals. When the fans turn off Co2 turns on for 5 min then gives 15 minutes for sacheration. No offence but on the high temp thing, its not just what people say. Its been proved that with proper Co2 usage people have been able to grow their plants in up 88° temps (now some people have said they have grew in the low low 90° temps but I wouldn't go that far lol.

I never said it wasnt true, I just have never read anything scientific backing it up......Its just bad advice telling people they can have higher temps with C02, some people get the wrong idea and cook their plants by keeping them higher all day, every strain is different so keep a close eye on them for stress when your venturing into high temp areas.

And I only let my grow get to around 88-90 MAX, but it never stays that hot longer then 3-4 min before the fans kick in.

Jeffdogg said:

The way my setup is, my fans are on a dual timer set for 4 times a day at 20 minute intervals My Co2 is set up on a timer for 4 times a day at 5 minute intervals. When the fans turn off Co2 turns on for 5 min then gives 15 minutes for sacheration. No offence but on the high temp thing, its not just what people say. Its been proved that with proper Co2 usage people have been able to grow their plants in up 88° temps (now some people have said they have grew in the low low 90° temps but I wouldn't go that far lol.

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jeff what is your cubic sq ft for the room you use that co2 setup in? and y do you only let your plants get 15 mins for saturation? is it because your temps get to high in that amount of time? at that rate how much co2 are you using in a week?

offgridgrower said:

jeff what is your cubic sq ft for the room you use that co2 setup in? and y do you only let your plants get 15 mins for saturation? is it because your temps get to high in that amount of time? at that rate how much co2 are you using in a week?

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My closet is now 4.5'x4.5'x8' = 162 cubic feet
Yes I'll only keep it on for that short period of time because of heat issues I have a 400w MH for veg and a 4oow HPS for flower. It gets a little warm in there without the fans on for a period of time. Check this calculator out.

CO2 Calculator - Greentrees Hydroponics

the way its setup a 20lb tank will last me 6 months. Thats using it 4 times a day at 4.5 minutes each cycle. I'm doing 18:6, doing 12:12 or 24:0 would vary in co2 usage.

yeah i used that website for my co2 too, my total cf was a lil higher than yours and i was looking to see how long a 20lb tank would last me, looks like i will be fine maybe 2-3 tanks in one year, not too bad. +rep for you!

offgridgrower said:

yeah i used that website for my co2 too, my total cf was a lil higher than yours and i was looking to see how long a 20lb tank would last me, looks like i will be fine maybe 2-3 tanks in one year, not too bad. +rep for you!

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Thx buddy Yeah my Co2 is set at 1500 ppm at 2CFH, tube runs around the pots (small ones maybe 4'' tall), going to build an extendable frame for when I transplant (prob out of pvc pipe nothing fancy), and run a co2 line so it leaks out at the top of the pots. I was lucky got a full tank of co2 for free lol, went on ebay got a regulator kit for about $80 with shipping.

jeff, youll be more efficient if you resease your CO2 above your canopy instead of at your pot rim. CO2 is signifigantly heavier than regular air. when i use gas i also make sure i have a ocsilating fan picking it up off the floor too.

Thx i'll do that When they get big enough can I just hang it around on the plants? lmao

Jeffdogg said:

Thx i'll do that When they get big enough can I just hang it around on the plants? lmao

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i hang it from my light, that way you know its plenty above the plants(we all know the light goes ABOVE the plants right!!!LOL). i had a problem once with the co2 pooling in my flood tray(heavier than air and all) and drowning my roots(roots need O2 not CO2). so i put a weak fan blowing it out of my tray. dont know if you use trays of not but figured it might help.

fuck fuck fuck shit jesus fuck....dont you guys hate the fact that regulators are soooooooooo fuckin' expensive...

ProudlySellin' said:

fuck fuck fuck shit jesus fuck....dont you guys hate the fact that regulators are soooooooooo fuckin' expensive...

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Its nothing new, they have always been expensive, kinda like how I dont get pissed off when I pay $50 for an HPS bulb.


Its only a couple hundred, one time cost, for an electric reg.

ProudlySellin' said:

fuck fuck fuck shit jesus fuck....dont you guys hate the fact that regulators are soooooooooo fuckin' expensive...

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Theres some decent priced ones on ebay got a newreg kit for about $80 with shipping included. It does suck most of the ones in the online shops are like $150+ Those damn little digi TDS and PH meters are expensive too

Jeffdogg said:

Theres some decent priced ones on ebay got a newreg kit for about $80 with shipping included. It does suck most of the ones in the online shops are like $150+ Those damn little digi TDS and PH meters are expensive too

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80 is pretty cheap. i dont have it anymore but my last tds stick was only 40 at my hydro shop. shop around youll find stuff for cheap, i got a air cooled 1000W hps rig for 180 and a 250W hps for 50.

and as far as buying the right stuff, think of the money your NOT spending on dope. an old grower once told me that pennywise is pound stupid.

really? awsome guys. thanks, or thank you ebay.....so i need a regulator, tank...and then the timer???

When you pick a regulator make sure its a kit like this

NEW CO2 Regulator Solenoid Complete Kit - eBay (item 230308798522 end time Nov-26-08 07:49:57 PST)

Then find yourself a tank (I was lucky to get a free 20lb tank) A lot of gas places will do swap outs kinda like stores do with kegs. But find a cheap tank on ebay dont have to be 20lb but I wouldn't get less then a 10lb tank.
And for a timer for the Co2 I got a timer that I set in minutes instead of 10-15 minute intervals (most digital ones lets you set in minutes) If you cant find a 3 prong timer for it (assuming your regulator has a 3 prong plug) you can get an adapter to put on the timer to make it a 3 prong.

Just make sure you check the Co2 calculator, I set my PPM for about 1500 on the Co2 calculator 1500 seems to be what a lot of people recommend. Also remember to set your fans on a timer to turn off while the Co2 is emitting and sacherating the plants (my fans are off for 20 minutes at a cycle) If I set it longer my temps will get too high so keep that in mind too bro

http://www.hydroponics.net/learn/co2_calculator.asp