Pop bottle CO2...am I missing something? - The Planted Tank Forum
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post #1 of 22 (permalink) Old 07-07-2008, 10:53 PM Thread Starter
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Pop bottle CO2...am I missing something?

Ok, I've been hunting around the DIY section for awhile now, and I haven't seen any pics of pop bottle CO2 systems. So maybe I'm missing something, but is it just a pop bottle (with mixture), an airline tube out the top (sealed), and an airstone to diffuse it into the tank?

I want to get a Hagen CO2 kit for my 10g, but I can't put any more money into this tank right now. If I can make something up with household stuff, then I can do it right now.

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post #2 of 22 (permalink) Old 07-07-2008, 11:13 PM
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http://www.qsl.net/w2wdx/aquaria/diyco2.html

óBill

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post #3 of 22 (permalink) Old 07-07-2008, 11:22 PM Thread Starter
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Awesome, thanks! Just what I was looking for...that I couldn't find!

~ 75g rimless cube (empty...discus?)
~ 55g w/ 11" Oscar & 10" Sailfin Pleco
~ 40g w/ 15g sump Bangaii breeding grounds (SW)
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post #4 of 22 (permalink) Old 07-08-2008, 03:54 PM
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Just don't use the one way valves. Hard to explain but the bottle will implode like you sucking the air out and force the reactor liquid into your tank. Causing unwanted results. Just be careful about a back siphon and you will be fine.

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post #5 of 22 (permalink) Old 07-09-2008, 01:16 AM Thread Starter
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I was hoping I could just toss something together with what I have at home so I could get CO2 going right away. I won't be able to buy one of the Hagen CO2 units for a couple weeks.

~ 75g rimless cube (empty...discus?)
~ 55g w/ 11" Oscar & 10" Sailfin Pleco
~ 40g w/ 15g sump Bangaii breeding grounds (SW)
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post #6 of 22 (permalink) Old 07-09-2008, 03:15 AM
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Don't bother wasting your money on the hagen deal--its just a way over-priced, under-sized DIY. That's all it is. Use that money for other stuff. Make Your DIY C02 setup yourself--you'll be much better off in every way.... Plus in order to maintain C02 stability--you really need 3 units going and then swap the oldest 1 out every week.

No idea what diyer is referring to. I've always used check valves, so have many others--its a recommended component.


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post #7 of 22 (permalink) Old 07-09-2008, 03:51 AM Thread Starter
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I don't have a cabinet for the tank (it's on a fancy open coffee table), so I don't want an ugly DIY unit. I was reading about using multiple bottles for stability...

When I have my 75g going with pressurised CO2 I will just splice the line, but it coule be next spring before that one gets going. LOL!

~ 75g rimless cube (empty...discus?)
~ 55g w/ 11" Oscar & 10" Sailfin Pleco
~ 40g w/ 15g sump Bangaii breeding grounds (SW)
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post #8 of 22 (permalink) Old 07-09-2008, 07:15 AM
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Quote:
Originally Posted by diyer3984 View Post
Just don't use the one way valves. Hard to explain but the bottle will implode like you sucking the air out and force the reactor liquid into your tank. Causing unwanted results. Just be careful about a back siphon and you will be fine.

I have to totally disagree here. After waking up in the middle of the night to 10 or so gallons on the floor (from an 80 gal) back siphons can happen at any time. Definately use the one way valves. Use an overflow bottle like pictured on a previous post. This overflow can also be used as a bubble counter by filling the bottle half way and inserting the input line below the water level, just don't go too high or it'll defeat the overflow purpose!

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post #9 of 22 (permalink) Old 07-11-2008, 04:10 AM
 
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Are you guys referring to the one way valves as check valves? If so I recommend using one as well.
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post #10 of 22 (permalink) Old 07-11-2008, 04:40 PM
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How does the water leak on your floor if the DIY CO2 system is a closed unit (for pressure purposes that is)? The worst that could happen is aquarium water gets into the co2 bottle.
Just wondering were the leak comes from??

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Check out my Daphnia Farm

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post #11 of 22 (permalink) Old 07-28-2008, 02:35 PM
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WOW did I stump you or did you just realize the error of your ways. A back siphon is better than killing your fish with the alcoholic brine.

If you cannot keep daphnia alive...I wouldn't even trust you with my pet rock!

Check out my Daphnia Farm

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post #12 of 22 (permalink) Old 07-28-2008, 05:40 PM
 
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I'm not sure but I think it just breaks your regulator.
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post #13 of 22 (permalink) Old 07-28-2008, 07:41 PM
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How would one get negative pressure to pull the yeast mixture out of a bottle? By placing the bottle above the aquarium?
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post #14 of 22 (permalink) Old 07-28-2008, 10:05 PM
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IF the bottle tips over, regardless of check valve, it can force the liquid out. This is why if my bottle tips over, it would pull the tube out of the tank. I'd rather have yeast/water on the floor than in the tank.
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post #15 of 22 (permalink) Old 07-28-2008, 10:52 PM
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Quote:
Originally Posted by diyer3984 View Post
Just don't use the one way valves. Hard to explain but the bottle will implode like you sucking the air out and force the reactor liquid into your tank. Causing unwanted results. Just be careful about a back siphon and you will be fine.
How in the world does a check valve cause the bottle to implode? I can see a valve that is completely melted closed causing the bottle to explode, but I just don't see the reverse happening. I bet almost every person here using DIY CO2 has a check valve inline and has no problems with it. As I see it the worst that can happen is this: You start with a fresh mixture and have almost no pressure in the line. The CO2 bottle fills with water as a result. As the pressure builds, you now have a full bottle and you have no air gap in the bottle. Now the pressure from the reaction pushes a a fair bit of the yeast mixture into your tank until the CO2 line is free of the liquid. I'll stick with the check valves.

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