CO2 DIY experiment
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Old 08-28-2005, 01:38 AM   #1
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CO2 DIY experiment


Ok, I'm not sure if this has been done before, but I thought I would try it out seeing as how I've been punished for carelessness twice now.

I got a testtube stopper with 2 predrilled holes in them and a check valve.



The idea is that if a vacuum is created by my powerhead reactor, then it will suck in air from outside the bottle, without letting any CO2 escape.




Does anyone see any problems in the future with this setup?

I was pretty excited about testing it out, so keep your fingers crossed!




And if it doesn't work, next up will be the Barr method.
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Old 08-28-2005, 01:47 AM   #2
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There are a couple things wrong with your setup.

First off, the process by which yeast feed off of sugar is an anaerobic one, if you are sucking oxygen into your co2 reactor you are going to severly retard your co2 production.

Second, I prefer the screw top bottle w/ a hole + some silicone setup myself, less likely to leak and pretty well proven.
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Old 08-28-2005, 01:58 AM   #3
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too right, kyle.


I tried the screw top bottle but got high off the silicone, got it all over my fingers, clothes, cat, rug, so I'm not too happy to do that again.

How much will it retard the CO2 production? As it is, that would be desireable for my setup. I think it may be the batch of yeast I'm using right now, but I usually have a more CO2 than I would like for the fish.
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Old 08-28-2005, 02:04 AM   #4
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From my understanding, the co2 production doesn't happen until all of the oxygen in the bottle is used up.

If you run the single line out of a bottle into a powerhead (which is what I do), the powerhead will "bypass" if there is no co2 in the bottle and just chug along. When enough co2 builds up in the bottle or is being produced, it will bleed into your powerhead and end up as a fine mist of bubbles. It works pretty well for me on my 10g.

Have you measured your co2 ppm? What kind of #'s are you seeing?
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Old 08-28-2005, 02:09 AM   #5
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Kyle, when you say "into a powerhead" , do you mean into the little hole at the top right before the outlet? Cuz that would make it soooo much easier.....
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Old 08-28-2005, 02:13 AM   #6
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Well, it depends on what kind of powerhead/filter you are using. In my 10g, I am using a dinky little "Duetto 50" right now. It has a tab you can flip up and a fitting for an "air intake" that is normally used just to oxygenate the water. I plug my co2 line right into that and the co2 bubbles get chopped up by the impeller in the filter.
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Old 08-28-2005, 02:21 AM   #7
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Ahhhh..... see, that's something I've got to try now. Luckily, I've two duettos lying around here somewhere. And you're SURE the filter won't suck in the yeast mix?????
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Old 08-28-2005, 02:38 AM   #8
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Here's a tip (I learned this the hard way).

I have a check valve as well but running OUT of the bottle not in, just so it doesn't suck oxygen back into the bottle. Make sure that the tubing you have in the bottle DOES NOT TOUCH THE MIXTURE! Initially mine did, and it did in fact pump yeasty water into my tank.

After fishing out 3 dead amanos and a cherry barb and doing a massive waterchange, I cut the tubing so it is only about 1.5" inside the bottle (I fill up a 2l juice bottle just to the top of where the label would be), and it's been great since then (aside from not lasting more than 2 weeks for me).

When I move and have more room for a tank (right now mine is on top of my dresser), i'll probably go pressurized, it's way less hassle
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Old 08-28-2005, 03:01 AM   #9
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Have you tried a "rigid bottle? I used 2x 1 gal Nalgene on 60 gal:

http://www.inmarkinc.com/images/lo1g...eneContain.jpg

but glass (with your stopper) would be fine too. Maybe someone sells apple juce in glass still... BTW inmarkinc seems to have a good selection of bottles.
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Old 08-28-2005, 10:04 AM   #10
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The only issue I'd have with glass is the shrapnel factor. If for some reason the output tube from the bottle got clogged, pinched or blocked for any reason, you would have a pressure buildup in the glass bottle.

If you're using a stopper then probably the stopper would pop out first. Not sure how much pressure it would take to blow the bottle, and perhaps DIY CO2 will never build up enough pressure to be able to do so, but I'd keep it in mind...
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Old 08-28-2005, 01:57 PM   #11
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Sugar and yeast can develop enough pressure to blow glass bottles. I make homemade root beer and every so often one of the bottles blow.
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Old 08-30-2005, 01:08 PM   #12
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Quote:
Originally Posted by Rex Grigg
Sugar and yeast can develop enough pressure to blow glass bottles. I make homemade root beer and every so often one of the bottles blow.
If this can happen with glass bottle will my gatorade bottle (new design bottle 9" long & 2 1/2" wide like a coke plastic bottle) blow as well?

Thanks!

-Brian
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Old 08-30-2005, 01:19 PM   #13
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Brian, I would imagine it would take a lot more pressure, and even if it did blow, at least you wouldn't have sharp shrapnel
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Old 08-30-2005, 01:21 PM   #14
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Thanks good info. to know!

-brian
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Old 08-30-2005, 04:07 PM   #15
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Pressure only builds up if you completely close the bottle. The point of DIY CO2 is to get the CO2 into the tank, not onto your walls. Just leave the end of the tubing open, please. That way nothing will explode, glass or plastic.

Plus, it's really easy to avoid collapsing bottles. Keep the CO2 outlet away from the vaccuum that's created by the impeller. There are various ways, like attaching the line to the outside and let the powerhead suck the bubbles in. Or bubble them from below into the reactor. Or feed the CO2 after the impeller, so there is some (a little) backpressure into the bottle.
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