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As far as the concrete is concerned, i was there when it was poured. Like code dictates there was heavy plastic put down first. However the plastic is in 10 foot wide pieces so I guess its not sealed at all on the overlapping seams . I assume a gas like CO2 will find the seams. For all i know...

Little more side info while I am waiting on CO2 level results.Yes, i use tank CO2 with a standard little solenoid valve controlled by an Autopilot APCECOD CO2 controller. It turns itself off at night and works perfect. Key to getting good results - adjust your release rate on the tank regulator...

I would not be concerned at all about higher CO2 accept the 3000 ppm CO2 level just about killed the seedlings. I have spent the last 10 days getting the levels down and now finally they are for sure recovering. Not sure if the long term affect will be a stunted plant like a early root rot...

I see a lot of ideas here to try to lower my CO2. If the plants were already 2 feet tall or so then this would not be a problem as any CO2 off gassing from the floor would be a welcome freebee as the plants would use every bit of it and lessen the load for me adding extra during the day with a...

Yes, the new concrete is looking more and more like the culprit. And yes, the concrete even though finished nice and smooth it seems very porous to water. I guess i could water it down and verify one last time the CO2 level shoots up. Long term fix, painting is in order. Short term i reluctantly...

Small update. I checked the room at 7 this morning. Door has been open a foot for a week now with a small floor fan. Finally for the first time the CO2 level was 375. I thought oh good what ever was going on has finally subsided. I closed the door and 4 hours later the CO2 was 1050 ppm. I am...

Yes, my A/C seems fine, It is a mini split, works perfect (near as i can tell). Farm land? Actually i was told that the area where my house is located was a heavy wooded forest 20 years ago and totally cleared to build the house.

Thank you for all replies. This is a metal building I had built. Poured the concrete slab 1 year ago to date. There is no controller or CO2 tank in the room at all, i removed it until i figure out what is going on here. It has 12 seedlings a few inches tall. However, there is 120 gallons of...

Read carefully. The room has 3 inch tall seedlings. 12 seedlings are not going to raise the CO2 level in a 10x20 room with 12 foot ceilings. The CO2 is coming from somewhere else yet to be identified.

I know there are several growers out there that have expressed concern over rising CO2 levels at night. Let me save a lot of time here and be very to the point. Originally i had CO2 levels rising to 1500 at night and returning to the daytime normal of 500 shortly after lights came on and the...

Originally this post was discussing rising CO2 levels at night. I had the same problem so joined in the talks. It was suggested that high humidity contributed to the release of CO2 at night hours. My humidity was too high in general and just yesterday I upgraded to a Quest Dual 155. Pulled the...

First let me say the reason i went to 12 foot ceilings is because when reality sets in with 8 foot ceilings a 3 foot plant is pushing the limit on height. By the time you hang your lights, maintain 24" above the canopy, the buckets i grow in start the plant already 18" from the floor. I got...

I should have known better than to tease like that.

Where did this idiot come from, "Lawd where did this clown come from,someone left the back door open to grass city" Typical indoor setup with 12 nice bushy plants in a 10x20 room, 12 foot ceilings. CLW 550, 12*1,280BTU = 15,360 BTUs Quest Dual 155 Dehumidifier, 8-9000 BTU per tech support These...

I need to add my experience here. My 10x20 (12 ft ceiling) room is totally sealed and sealed tight. I use bottled CO2 with the fuzzy logic Autopilot controller. When I first set the room up my CO2 was all over the place and I was very unhappy with the controller. The problem was i had the valve...

My experience is as follows. First. I don't know what your humidity is but can can tell you that young plants like humid air, 50% is way too low. Young plants, seedlings, new clones I would keep closer to 70% until they get going strong. When the humidity is low the plants perspire so to speak...

I call bullshit. 4500W of light, 3 chillers and 24K AC unit is not going to cut it. Pulling the room down to 65 degrees in 10 minutes ain't happening. There is something you are not telling us or you just don't really know what you have.

I use the Bluelab Guardian Monitor and yes i cal it every month when it starts flashing. I really don't think my meter is the issue. The meter (i have 2 actually) has been very stable. My problem is, everything is fine for the first 4 or 5 weeks. About 1 or 2 weeks after first hairs are spotted...

I have very similar issues. About 1 week into flower my PH drops to 4, every time. Does not matter what line of nutes I am running. I keep my water temps at 64-65 and never have root issues. I can flush the entire system and the next day i have the exact same issue. So far I just add PH up 5 or...

I just bought my second UC system. The first one (2 years ago) came with air stones and they work fine still. The second one came with this pourous hose crap. I will try them but will also be prepared to drop in air stones as a replacement. On a side note without going into details, I have built...