Co2 Level for a Perpetual Sealed Room???

[Bad Habits]

Hey folks-

I'm running a 5400w sealed flower room right now. I have three 2x8 trays in the room, and am running a perpetual harvest with each tray about 2-3 weeks spaced apart.

For my first round, I started the Co2 at 900ppm as per some suggestions on here. As I got to be about 2 weeks out from cutting down, my friend said I needed to drastically lower the Co2 for the last couple weeks, stating a higher PPM was detrimental in the last few weeks of flower. Being my first round in the room and not wanting to take any chances I lowered it to 500ppm.

Seeing as how the room is perpetual and there will always be 1 tray that is in the last few weeks of flowering, what is a good "middle ground" for Co2 PPM? Obviously 500 is too low for the majority of the flowering cycle, but is 900+ really going to significantly lower the end product of the plants in the end of the flowering cycle?

Thanks everybody

 

[Treetroit City]

I'm curious how it is detrimental. I've heard the same thing but never really the science behind it.

I also wouldn't say 500 is too low for flowering as it is about 100-150 ppm more than anything growing without supplementation. Maybe not ideal but certainly not too low.

 

[Bad Habits]

I'm curious how it is detrimental. I've heard the same thing but never really the science behind it.

I also wouldn't say 500 is too low for flowering as it is about 100-150 ppm more than anything growing without supplementation. Maybe not ideal but certainly not too low.

Definitely interested in having some other people chime in on this as well - is there some science behind it? Dunno if there might be a better sub-forum to post this in...

Thanks for stopping in.

 

[dabking]

I run 3k 3 4x4 trays perpetual I have no problems with keeping my co2 between 900/1000 ppm all the time. And everyone is happy with the results ��.

 

[Bad Habits]

I run 3k 3 4x4 trays perpetual I have no problems with keeping my co2 between 900/1000 ppm all the time. And everyone is happy with the results ��.

Nice! This is definitely reassuring. Have you ever experimented with different levels out of curiosity?

 

[dabking]

I've ran it a little higher with no real difference, but lower you'll notice the difference

 

[flyer81]

I average about 600 ppm just in background air and have excellent results. In the winter months I supplement and have my ppm meter set at 1300. I regularly see it spike to 1700 and have not had any issues.

Dont worry too much about the PPMs. Focus on getting control over your environment and ensuring that it is stable and does not go outside of the norms. Temperature, humdity, etc.

 

[Bad Habits]

^ thanks for the input guys. I think for now I'll stick with 900-1000 ppms and see how the next run turns out

 

[budleydoright]

I run 3k 3 4x4 trays perpetual I have no problems with keeping my co2 between 900/1000 ppm all the time. And everyone is happy with the results ��.

I second that. I run 1000 ppm during the photoperiod with room temps in the high 70's, canopy temps mid-low 80's.

I have run 1500 with a hotter room but always seem to settle in on 1000. I run 8k flower perpetual with a pull every 2 weeks.

Be aware that many auto calibrating co2 controllers will auto calibrate themselves thinking that the lowest co2 concentration every 24hrs is ambient or around 350ppm. My sealed room never goes to ambient. When the lights go out the co2 levels stays around 550-600. Auto calibration would see this pattern and and assume that the 550-600 it sees every day should really be 350-400 and re-set. You meter is now 250 ppm off. This can happen over and over. Turn auto calibration OFF.