"Suspending" DIY CO2? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 08-16-2013, 12:35 PM Thread Starter
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"Suspending" DIY CO2?

Looking at branching out from low tech/low light starting with the proverbial pop bottle CO2.

My understanding though is that ideally we only want to inject during the day and not after lights out (hence the timer controlled solenoid on the big rigs), but off the cuff I don't think I've ever seen this discussed with DIY CO2...
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post #2 of 8 (permalink) Old 08-16-2013, 01:07 PM
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With DIY co2 you can't do this - but you frequently get a much lower output rate, so you really can't afford to cut it off at night anyway.

With a solenoid/tank system you just put it on a timer.

What size tank do you have? You can gas fish at night with DIY in a small or nano tank, but would be perfectly fine in a larger one.


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Last edited by Darkblade48; 08-16-2013 at 09:21 PM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #3 of 8 (permalink) Old 08-16-2013, 01:49 PM Thread Starter
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8Gal.

If the plants arnt using CO2 at night anyway (and thus its going to waste), what would be wrong with having a valve (or even just unscrewing the cap) at night?
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post #4 of 8 (permalink) Old 08-16-2013, 03:40 PM
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Quote:
Originally Posted by Ziggy View Post
8Gal.

If the plants arnt using CO2 at night anyway (and thus its going to waste), what would be wrong with having a valve (or even just unscrewing the cap) at night?

Well, I don't think you want to have a valve since that would cause pressure to build up in the bottles and possibly cause an explosion. You could take a cap off but.. every morning you'll have to wait for the pressure to build again and lose time before the co2 ramps up again.


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post #5 of 8 (permalink) Old 08-16-2013, 04:27 PM
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A valve to divert the CO2 to atmosphere would be okay, but at le0p said, you don't want to loose your pressure, and all that CO2 that's in the bottle.


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post #6 of 8 (permalink) Old 08-16-2013, 04:51 PM
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I have heard of people having a splitter on a valve and and a ballon for the co2 gas to fill up, I would guess that would help you get a good start at lights on time, but I would guess the ballon would need to be replaced from time to time from the co2 eating away at it, I saw a post on here where someone does this but I can't find it
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post #7 of 8 (permalink) Old 08-16-2013, 06:00 PM
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Hah, funny I should encounter this thread at the same time I came across another one that taught me something. I also thought you couldn't easily suspend diy co2 but this guy 'Hardstuff' explains how he does successfully it with Tom-Barr-s-DIY-Internal-Reactor-w-venturi

in page 2 of this thread in the algae section:
Not enough CO2 or Too much light?

The idea would need to use a reactor to diffuse your co2. Since it's powered by a powerhead, you merely put that on a timer and run it when you want to diffuse and stop it when you don't. So when the powerhead is stopped, there's an escape valve so that you dont have to worry about stopping the gas from entering. You just let it form a huge bubble and float harmlessly up to the surface.

You haven't mentioned how you intend to diffuse so if you were going to build a reactor, this might hit your bird too.

Last edited by ipkiss; 08-16-2013 at 06:02 PM. Reason: Link edit
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post #8 of 8 (permalink) Old 08-18-2013, 03:37 AM
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I've been running a TEC regulated CO2 system for a couple of months now.

The basic idea being that yeast growth is tied to temperature:
http://www.weekendbakery.com/wp-cont...tActivity1.gif
http://vanimations.com/2008_2009/mid...iew_goal_1.htm

The prototype works, though I haven't yet built the controller (easy) or neat and properly insulated housing (harder). I'm not sure I'd call the system practical as it requires a huge heat dump relative to the amount of CO2 being produced.

I haven't had time to write up any cohesive documentation but I'd be happy to answer questions if anyone is interested.


edit:
a simpler idea I've been wanting to try:

Yeast apparently stops growing at around 100psi (some bacteria do not - sterilize everything).
So yeast/water/sugar/etc in a suitable pressure container should self regulate.

The only pressure containers I have access to are old domestic LPG bottles, and they're apparently only good for ~120psi when new... so I haven't tried this yet.

Last edited by vim; 08-18-2013 at 03:51 AM. Reason: edits
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