Warrioreuel
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250-350ppm | Normal background concentration in outdoor ambient air |
350-1,000ppm | Concentrations typical of occupied indoor spaces with good air exchange |
1,000-2,000ppm | Complaints of drowsiness and poor air. |
2,000-5,000 ppm | Headaches, sleepiness and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate and slight nausea may also be present. |
5,000 | Workplace exposure limit (as 8-hour TWA) in most jurisdictions. |
>40,000 ppm | Exposure may lead to serious oxygen deprivation resulting in permanent brain damage, coma, even death. |
Awesome infoActually sorry for double posting but wanted to be correct and wanted everyone to know the correct ppm & proper levels . I looked at few websites and this is what I got ( sorry for w/e I thought 5,000ppm was deadly lol)
CO2
250-350ppm Normal background concentration in outdoor ambient air 350-1,000ppm Concentrations typical of occupied indoor spaces with good air exchange 1,000-2,000ppm Complaints of drowsiness and poor air. 2,000-5,000 ppm Headaches, sleepiness and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate and slight nausea may also be present. 5,000 Workplace exposure limit (as 8-hour TWA) in most jurisdictions. >40,000 ppm Exposure may lead to serious oxygen deprivation resulting in permanent brain damage, coma, even death.
Sorry for the oversight. Is there any chance of a chemical reaction or fungus/yeast growth?. The reaction between something like sodium bicarb, often used for raising Ph, and something acidic, like you often see from hydro setups that run lower Ph ranges, can release CO2 as part of the reaction between the two. Cement floors and acidic liquids? Decomposition of Formaldehyde in OSB products? I have to admit... you seem to have covered all of the bases except a sizable algae growth in the res tank (Very unlikely) or some other type of biological growth, since it seems to be light dependent.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.
You can easily check the CO2 levels in your nutrients and I would say from years of injecting CO2 into water it's definitely not from your water. CO2 dissolved in water creates carbonic acid. CO2 is very hard to dissolve in water and quickly moves back towards equalibrium when amounts are above equalibrium. It won't store CO2 like ppl think. You will see ph changes from day to night if this was an issue. I grew aquatic plants for years using a CO2 reactor to inject CO2 into my water and I can tell you its not easy to dissolve in water without added pressure and off gasses extremely fast. To give you an idea of how noticable it is with a KH (carbonate hardness) of 4 to reach 30ppm of CO2 above equalibrium you would be looking at about 1.0 ph dropThank 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 water circulating in a DWC setup with Cal-Mag, Aqua Flakes and nitric acid to keep the PH just under 6. It also get about 150 ml of UC roots once a week to keep away root rot. Since the seedlings are small my nutriet strength right runs approx 120 ppm. This is not my first setup but it is a new grow room in a new area so to speak. The RO water by itself is almost exactly PH 7 with 20 ppm, so its pretty clean. At this point my list of suspects (process eliminatus) is the concrete is off gassing CO2 (or poured on top of a CO2 source bubbline through the floor), the OSB walls, the paint and now possibly the nutrients in the water off gassing (had not thought of that before). So far i have left the door open now for a week with a floor fan and the levels are down to low 400's. If I close the door they will rise so as a stop gap measure i will simply leave the door open for now. CO2 absorbent media hopefully be here this week. When it gets here my intention is to route the air through it before it bubbles through the air stone. I am hoping that this will least scrub my water of CO2 which was most likely saturated with CO2 gas when the room was 3000 ppm. It would be nice to have a device to check to dissolved CO2 level in the water to see if I am actually having any impact with my corrective measures. I suppose recovered healthy plants will be the final indicator but I like to know really what is going on. I suppose if this were a dirt grow then the free CO2 would be fine. But, in hydro it is poisoning my water.
Here are some questions. Is an OSB walled painted with latex a true barrier for CO2 or does it pass through the wall as if it were nothing more than a bug screen? Does concrete retain CO2 like a sponge? In other words when my levels were over 3000 ppm, did the concrete absorb this and now slowly releasing it?
What I'm not getting from that article is that it absorbs and stores at rates higher than equalibrium. Infact it renforces my point. If CO2 is higher in the air than the concrete it will absorb and if its lower it will release. So unless he had his CO2 at 3000ppm I can't see it giving off those levels as it's try to reach equalibrium. CO2 levels in your house will rise just from people and animals breathing and higher levels will accumulate in basements as the gas is heavier than most that make up air.Thanks for the post, it made me look into an issue I've had for sometime. High co2 hasnt been an issue for plants, but for my corals..yes. I have around 500ish gallons of reef tanks in basement and maintaining the ph is a constant struggle. I determined it was from elevated co2 in and connected an air pump that draws air from outside to tanks. This helped(ph was 7.8 constantly, after air pump 8.0) but still struggled to hit that 8.3-8.4. When I left windows open for several hours it would help ph a little more. But after closing ph would lower in hour or 2. Read your post and it made me look up co2 and concrete. Found an interesting read, although it doesnt say how to fix it persay, it tells me that I need to find a way to pull in fresh air on a regular basis and at same time pull air out. Would be nice if an automated device exists for this purpose and not alot of $$$$.
Thanks again, would of never looked into it with out reading your post. Heres the article
Or concrete sealer I think silicon based liked used for treatment of mold would be ideal but also very toxic so I would make sure to wear proper ppeOk the reason I asked about farm land is a phenomenon called "soil capping" where essentially the soil becomes so waterlogged it cannot retain gases anymore and the co2 actually comes out of the ground and will then travel to the lowest point. Sometimes will even come through basement walls so I would say this may be a possibility, though unlikely as it usually happens as a result of previous fertilizer use. However, forest land can be just as rich, so that's why I say it's a possibility. It normally only happens when it rains, though. People have had their pilot lights go out on water heaters and furnaces because the co2 became so thick it actually smothered the flame.
The article above is correct, as well. Concrete will absorb and release co2.
As a cheap, possible solution perhaps you should go to walmart or home depot or the like, and buy a big roll of plastic sheeting. It varies in price depending on how thick it is. Obviously the thicker the longer it will last, so buy enough to line the entire floor and see if that takes care of the problem. You could even seal the edges and corners with some duct tape or something. I bet that takes care of it.
Like h2s created in the same conditions from rotting organic matterOk the reason I asked about farm land is a phenomenon called "soil capping" where essentially the soil becomes so waterlogged it cannot retain gases anymore and the co2 actually comes out of the ground and will then travel to the lowest point. Sometimes will even come through basement walls so I would say this may be a possibility, though unlikely as it usually happens as a result of previous fertilizer use. However, forest land can be just as rich, so that's why I say it's a possibility. It normally only happens when it rains, though. People have had their pilot lights go out on water heaters and furnaces because the co2 became so thick it actually smothered the flame.
The article above is correct, as well. Concrete will absorb and release co2.
As a cheap, possible solution perhaps you should go to walmart or home depot or the like, and buy a big roll of plastic sheeting. It varies in price depending on how thick it is. Obviously the thicker the longer it will last, so buy enough to line the entire floor and see if that takes care of the problem. You could even seal the edges and corners with some duct tape or something. I bet that takes care of it.
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