Help, CO2 trying to convert bubbles to ppm

I just got a CO2 tank and regulator with a bubble counter for my new stealth cabinet. 36' wide by 72" tall.
Now I know where there is a calculator to tell me how much I need per square foot (greentrees) but it is measured in ppm.
Does anyone know how many bubbles per min (BPM) equal 20 PPM

After researching this I found a post from someone who was talking about their fish tank and they said 28 bpm gives them about 15 to 20 ppm. But I cant find anything to back it up.

So, anyone here use a bubble counter?

Actually what Im trying to figure out is how many bubbles per minute would give me 0.0432 cubic feet = 1200 ppms in my grow area.

Any Math wizards out there?

Dp you have a way to check your co2 ppm as to use the co2 you will need to have it on a timed release and be able to know how long your co2 ppm stays at 1200 or the more standard 1500 ppm in this unit. You have to time the air exchange to the time it takes before a frewsh co2 injection. On my co2 tanks I use a timer and solenoid. I open my valvees and ball valve full and run 3 minute bursts in my 8 foot by 8 foot by 10 room. I time it so It injects every 2 hours for a fresh 1500 ppm level.I have dampers on my inlet and outlet air vents so they close tight when not in use. Then 5 minutes before the next co2 injection timers open the dampers and do a room air exchange sucking all the old air out bringing in new fresh air in then they go off after 4 minutes and the dampers close then the new co2 injection kicks on filling the room to 1500 ppm again. This repeats the entire time lights are on and you wanna keep temps 80-85 when using co2. If you dont have any kind of co2 monitor or tester your gonna be guessing and wasting co2.Just make sure you have a tilt fan on the floor as the co2 is heavier then air and will sink to the floor and needs to be blown back up and circulated so have the internal fans moving the rooms air constantly.Make sure the grow area is air tight and the outlet and intake are closed tight until room air exchange..too much co2 will cause the plants to sag and wilt and slow the growth stages.No need for co2 during lights off but use it from veg til harvest.

Hey Flech,

Great info.

Yes I have done my homework and understand 1500 ppm is needed. I also understand the air naturally has 300 ppm so thats why I was trying to figure out how to get 1200ppm. Thing is, I got cheap on the regulator and bought one designed for a fish tank with a needle valve and a bubble counter. Its very exact however the flow gage means nothing once you turn the valve.

Thanks for the info on your setup. I am trying to do the exact same thing. all I need to know is how long to inject the co2. I found a calculator at greentrees hydroponics. Thats where I buy most my equipment but they wanted $150 for hydrofarms reg and I got this on ebay for $60

I know it will work just fine I just need to convert bubbles to cfm or cfh something I can start with.

No I dont have a meter thats why I plan on timing it. I plan to have it slowly emit co2 while the lights are on and use an attic fan thermostat to exaust. I am running T5 flouros and leds so there isnt much heat. Actually temp peaks at 85 and the low is 65 so it wont go on much. and yes I have a lower fan to circulate the co2.

Thanks for posting

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cruzer101 said:

I just got a CO2 tank and regulator with a bubble counter for my new stealth cabinet. 36' wide by 72" tall.
Now I know where there is a calculator to tell me how much I need per square foot (greentrees) but it is measured in ppm.
Does anyone know how many bubbles per min (BPM) equal 20 PPM

After researching this I found a post from someone who was talking about their fish tank and they said 28 bpm gives them about 15 to 20 ppm. But I cant find anything to back it up.

So, anyone here use a bubble counter?

Click to expand...

i dont think you have enough space to justify adding co2. im no expert by any means, however i read an interesting post of PS where they held a poll and determined that small grow spaces made it almost imposible to regulate the co2 properly. i think there are products that produce co2 when mixxed with water , or even the co2 from our own breathing is beneficial, like i said im no expert so dont quote me on this sh!t. good luck and let us know how you make out..

Hi Jasholeo

Interesting Opinion. I always thought it would be easier to control because of the small size. I would think in the article you read the people were using HPS or MH lighting and the cabinet would have to be constantly ventilated. Not so in my case. I am using low heat light source.
I am running LEDs and T5s to keep the heat and the wattage down so I think I will get it to work if I can convert the measurement.
We shall see.

Thanks

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I am also having the same problem with the BPM. The guage is set at 10 PSI and use a solenoid valve as well. I let it turn on for a half hour, at this time the axhaust fan is off but the intake fan is left on (is that bad?). The exhaust fan is left off for about two hours then I let it run for about 45 min till the CO2 Disperses again. and goes through the same process about 5 times during the lights on cycle. Oh and I dug out a grow spot in the crawl space of my basement. It's about four feet high, and roughly 4X6. I've been told CO2 is not necessary but I have the setup and I'm going to use it damnit! I use a 1 foot panel LED 50w and four 300 watt CFL's with three addithional 150 watt CFL's. I have the equipment for MH and HPS just no room for it. What do you think? I don't want to kill my plants but I want the most out of them. Are there telltale signs of too much CO2?

I also need help with this! I have 400cubic feet. Figure I need 5 minutes at 5CFH, but my tank has a bubble counter on it, and not a flow valve that shows cfh. Anyone know a way of converting or know waht the CFH value is opened fullblast?