Fully automated DIY yeast CO2 as good as the CO2 tank? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 03-16-2005, 05:45 PM Thread Starter
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Fully automated DIY yeast CO2 as good as the CO2 tank?

Check this out. I bought the whole damn 9 yards last week. A fully automated CO2 system with CO2 tank, regulator, controller, everything. Well, as it turns out my bubble counter had a leak in it, so I had to request a new one be sent. In the meantime, I hooked up a 2-liter bottle of DIY yeast to my reactor and instead of plugging the CO2 tank solenoid to the controller, I plugged the reactor into the controller. That way it flips the reactor on if the PH is too high and turns it off if it's too low. The CO2 bubbles from the 2-liter bottle don't do much without the reactor on.
After carefully monitoring my PH, it seems like the DIY CO2 works just as well as the CO2 tank! I could've cut my $350 cost down by like half just using that method. I wouldn't need the tank, regulator, or bubble counter that way and the tank alone was $100 after taxes and such (I got the 10lb).
Anyone else using that method or tried it out? I am surprised at how well it seems to work.
The only negative I can think of is in the middle of the day if the plants are sucking the hell out of the CO2 and the yeast can't keep up, I can't really crank it up any more.
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post #2 of 9 (permalink) Old 03-16-2005, 06:14 PM
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I've done it before when I had to wait to get my CO2 cylinder filled.
And it did work OK. But I could not get the CO2 Past 20ppm.

There are many benifits to using the Cylinder vs. DIY bottle.
Don't have to worry about changing bottles every week.
CO2 remains constant for months not days.
NO chance of getting your fish Drunk.
you can add CO2 to more tanks for a little extra $.

While I still will use the DIY hooked up to the Reactor on
an emergency. DIY is just to much of a pian.

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post #3 of 9 (permalink) Old 03-16-2005, 06:53 PM
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Call me crazy but I don't think I will ever go pressurized.
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post #4 of 9 (permalink) Old 03-16-2005, 07:02 PM
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Aphyosemion:

A closed container with expanding gasses is a bomb so be careful about recommending such a system.

If the controller is high (open) your system will act just like the controller is not present. If the system goes low (closed) you are going to build pressure. Either the bottle will explode or the controller will open and let all the gas accumulated into the system as a large surge... Which will look a lot like leaving the controller open... If there is no explosion.

DIY and reactors in general do not play well together because there can be a lot more pressure. There is a post of some poor soul that sucked the contents of the DIY into the tank via a inlet reactor. I assume there are others that have popped of hoses or exploded DIY with a rector on the output too.

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post #5 of 9 (permalink) Old 03-16-2005, 08:25 PM
 
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Disconnect it now! BlueRam hit the nail on the head...with the solenoid closed, the pressure WILL build up in the DIY 'bottle', and it WILL eventually explode. YES I have personally had it happen. So far you've been lucky to not have enough pressure build up before the tank needed CO2 again. Luck has a habit of running out.

And Urkevitz...not sure why you fear pressurized. its a little more costly to setup...but you can run multiple aquariums from 1 CO2 cylinder/regulator...so in terms of maintenance and convenience, pressurized is the ultimate setup.
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post #6 of 9 (permalink) Old 03-16-2005, 10:16 PM
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Aphyosemion, You the man!

However, Blue Ram is right, you need to change your setup a bit.

To avoid exploding bottle, I would hook up airline from the DIY bottle to venturi attachment of the powerhead to the reactor. It is very important to setup the powerhead higher than the reactor, so when the solenoid turn off the powerhead, the steady flow of CO2 will rise up to the surface through the powerhead's blade.

Make sure there is a free flow path for CO2 to escap to the surface when the powerhead is off. You don't want to create too much back pressure to the DIY bottle. I think it's helpful to setup the powerhead as high up near the surface as possible.
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post #7 of 9 (permalink) Old 03-16-2005, 10:22 PM
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Quote:
Originally Posted by BlueRam
Aphyosemion:

A closed container with expanding gasses is a bomb so be careful about recommending such a system.
I don't think that's what Aphyosemion is saying/doing. If I understand him correctly, he is just hooking the powerhead driving the reactor to ph controller. With powerhead off, not much CO2 will be dissolved when you reach the max CO2 level.


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post #8 of 9 (permalink) Old 03-16-2005, 10:27 PM
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Yes, that appears to be correct. I was thinking inline reactor and not powerhead type.

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post #9 of 9 (permalink) Old 03-17-2005, 02:51 AM Thread Starter
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Yeah, if the controller flips the power off, the CO2 still goes into the reactor, but just bubbles out without doing much. With the controller flipping the power on, the reactor is running and mixing the CO2 and water. There is no risk of the 2-liter bottle blowing up. That is a similar method that I use in my other tanks, except without the controller. In my other tanks, I just have the reactor set on the same timer as the lights.
-Aphyosemion

Two 1 GA desktops, a 5 gallon, a 2.5 gallon, a 10 gallon, a 20 gallon, a 25 gallon, and two 75 gallon tanks, all planted.
I am an expert on algae, so ask me if you have questions. I know how to grow it, just not how to get rid of it.
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