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Mr. Tambourine Man (Tambourine_Man)
Posted on Friday, February 01, 2002 - 07:11 pm:Edit Post Quote Text Delete Post Print Post Move Post (Moderator/Admin Only)

Hi, how can tell if your air exchange system is doing enough to get rid of CO2 on its own? Is there any kind of a "test" of any kind that you could run? Thanks!
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Ron (Clubbenguy)
Posted on Friday, February 01, 2002 - 07:30 pm:Edit Post Quote Text Delete Post Print Post Move Post (Moderator/Admin Only)

Try this, http://www.77hydrostore.com/

(Message edited by admin on March 16, 2004)
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Mr. Tambourine Man (Tambourine_Man)
Posted on Friday, February 01, 2002 - 07:57 pm:Edit Post Quote Text Delete Post Print Post Move Post (Moderator/Admin Only)

Ron-

Awesome, thanks for the info! But, I'm not sure how that "CO2 Test Kit" works. It looks like a syringe, so I think it's gotta be to test the CO2 content of water? Is that right? Any ideas?
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Ron (Clubbenguy)
Posted on Friday, February 01, 2002 - 10:23 pm:Edit Post Quote Text Delete Post Print Post Move Post (Moderator/Admin Only)

Not sure, i just went to www.google.com and typed "CO2 testing kits" and there was a bunch of sites. I am not sure, but the last CO2 test kit on the bottom of that screen said "to test the CO2 levels in your grow area." Wasnt sure what that meant but GOOD LUCK!!
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Ryan Waters (Zerogravity)
Posted on Saturday, February 02, 2002 - 04:46 am:Edit Post Quote Text Delete Post Print Post Move Post (Moderator/Admin Only)

Excellent thread Mr. Tam! (In other words you beat me to it!)

Stamets says the CO2 should be less than 5000ppm when fruiting so it would be good to know what is going on in the terrarium. After all the other parameters are easy to gauge (temp, light, & humidity)so why not CO2.

Found 3 links that may be useful.

1. Electronic, lots of $ but each test is free
http://www.solvita.com/solvita.htm

2. Looks simple and inexpensive but results take 4 hours.
http://www.airspill.com/scripts/shopplus.cgi?DN=airspill.com&CARTID=%cartid%&FILE=CO2Detectors.html

3. This is the syringe that was mentioned earlier. You simply suck in the air and results are within 2 minutes. Syringe is roughly $25 - 40 but each test will cost you between 6-9 (all pricing is USD) This syringe system is the most common method my quick search revealed. This tells me it would be easy to get at any hydroponics store.


Would be good to make sure these will go above 5000ppm just in case you are too high and want to see by how much. Ambient atmosphere is between 300 - 500 ppm.

(Message edited by admin on March 16, 2004)
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Ron (Clubbenguy)
Posted on Saturday, February 02, 2002 - 06:21 am:Edit Post Quote Text Delete Post Print Post Move Post (Moderator/Admin Only)

Well if you went to the link I mentioned, they offer the syringe testing method in which you get two test syringes and the test kit for 18.95 (plus shipping).
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Hatcher (Hatcher)
Posted on Saturday, February 02, 2002 - 07:34 am:Edit Post Quote Text Delete Post Print Post Move Post (Moderator/Admin Only)

Cain't say for shore guys, but, I'd guess I'd be speakin' for most of tha people here in saying "don't worry 'bout it." Remember the KISS principle I say. Posting has been goin' on 'bout even the need/frequency of fanning. And, like was mentioned, by exchanging the air, you're eliminating your humidy, which has to be restored..possibly(he was sure of it, I'm skeptical,) affecting size and yield. In either case, ya still gonna have to provide the extra water..
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Brettiejams (Brettiejams)
Posted on Saturday, February 02, 2002 - 08:07 am:Edit Post Quote Text Delete Post Print Post Move Post (Moderator/Admin Only)

Co2 is heavier than o2, so if the exhaust hole is near the bottom of the terrarium you can bet that it is a good concentration of co2 that is escaping, even if the air coming in to displace the lost air isn't entering with enough force to mix the gasses well.