DIY co2 - turning it off at pm? - Page 2 - The Planted Tank Forum
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post #16 of 24 (permalink) Old 11-17-2011, 07:35 PM
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Originally Posted by somewhatshocked View Post
growingthings: Definitely won't blow up your house. Most 2L bottles used today are rated for at least 90-100psi. At most, you'd just have a disgusting, smelly mess all over your room… and that is NOT fun.

Having played around a bunch with fermenting beer under pressure, yeast will shut down well before they get to 90 PSI.

On the other hand, opening a coke bottle at 50PSI probably would make a mess anyways.
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post #17 of 24 (permalink) Old 11-17-2011, 11:22 PM
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I use the internal powerhead reactor approach for my DIY CO2. I just plug the powerhead into the same timer as the lights.

I'm guessing that this gives me a more stable pH -- that the increase in CO2 and reduction in O2 production by plants at night will somewhat compensate for the reduction of injected CO2, leading to a more stable pH. However, it might not compensate for the lose of a bunch of CO2 in the water column (I really need to test this).

Have others seen better (smaller) pH swings when shutting off CO2 (as opposed to leaving it on). For me, the wasted CO2 cost is minimal. I'm much more interested in the health of my fish (I don't think the plants care all that much about the pH swing).

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post #18 of 24 (permalink) Old 06-11-2013, 01:54 AM
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I am almost positivetThere is no way the co2 2L bottle would expload..... Soda bottles can usually hold 115 psi befor exploding.( tested by me when making air cannons). Yeast is not capable of making this high of pressure. There just is not enough energy stored in it. My dad also accidentally pinched my line on my set up by dropping stuff on it. It was pinched for two full days and it barely stretched the bottle. Ps. Before they expload they stretch ALOT kinda like a balloon so if you glance at the bottle and it doesn't look extremely deformed its not gunna blow. The seal connectig th hoses to the bottle will definitely go first. Even the hose might burst before the bottle. Lol
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post #19 of 24 (permalink) Old 06-11-2013, 02:22 AM
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why not put a y in the air lines and put in a couple valves and shut off the one going to the tank and open the other one a lil to off gas some pressure so as bottle dont explode
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post #20 of 24 (permalink) Old 06-19-2013, 11:39 PM
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Originally Posted by somewhatshocked View Post
In a couple of my DIY setups, I plumb a cheap plastic knob/valve into my line that I can open up to gas off CO2 if it ever becomes too much. Never had to use it but it works well in testing.
Got a pic of it? Where did you get the knob/valve?
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post #21 of 24 (permalink) Old 06-20-2013, 02:17 PM
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Originally Posted by JasonG75 View Post
What i did was remove the diffuser and place it in a cup of water overnight.

I used glass diffusers.
I like that idea.

You have DIY Co2 with just the yeast mixture in bottles hooked up to a glass diffuser? Read that they don't always work with DIY Co2.

Last edited by Hilde; 06-22-2013 at 09:39 AM. Reason: added text
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post #22 of 24 (permalink) Old 06-20-2013, 02:58 PM
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All right for bringing an old thread back to life, folks.

It's absolutely not necessary to use a valve.

But you can get them at any aquarium retailer or even a plumbing supply center. Airline gang valves work and so do flow restrictors that are connected with an airline T.

Originally Posted by Hilde View Post
Got a pic of it? Where did you get the knob/valve?
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post #23 of 24 (permalink) Old 06-22-2013, 09:37 AM
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Originally Posted by growingthings View Post
Im wondering if theres something in between DIY CO2 and pressurized?
On Ebay I have seen DIY Co2 kits for sell. More info here

Hoppy said,"It would be very difficult to get enough CO2 from one 2L DIY bottle to do the slightest harm to the fish. Wit a 45 gallon tank I used 2 -2L bottles, and never got more than about 20 ppm of CO2" Thus will experiment with this theory.
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post #24 of 24 (permalink) Old 06-22-2013, 03:08 PM
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+1 on running the CO2 into a powerhead on the same timer as the lights.

I disagree that DIY is only for small tanks; I do it on ~200 gallons.

I also disagree about the explosions. I've done it with DIY beer and root beer (albeit in glass bottles). Still have the marks on my ceiling to prove it
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