CO2 Question... - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 16 Old 07-10-2008, 09:20 AM
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I still personally disagree, because your data is still a forum; not any hard evidence that YOU did not post. In the end it doesn't really matter though...
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post #12 of 16 Old 07-15-2008, 09:17 AM
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The problem with putting a control valve and potentially even completely stopping the flow of co2 in a DIY system is that you will EXPLODE your co2 generators! Just because you stop the flow of co2 into your tank does not mean that the co2 is not being produced in your plastic bottles or whatever you're using. You may be able to slightly restrict the flow for a little while but you will still be backing up the co2 in your generator and will have to eventually let it out to avoid explosion. If you want to control the amount of co2, purchase a compressed system. Unless you have a larger tank a DIY system is fine if you don't mind the maintenance. If you restrict or stop the flow you will end up with a big giant mess.

A possible solution is creating something like a storage container to store that excess co2 while your lights are off, but you would still need to ensure that all of that co2 was evacuating before the end of each day otherwise you are still going to end up with an explosion at some point.
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post #13 of 16 Old 07-15-2008, 01:43 PM
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I'm about to implement a DIY system pretty soon. After doing some research here are some interesting things you could do to help the process.

First, and this in my opinion is most important, if you use a tee valve to seperate your tubing between your generator and reactor then sand down the exposed end and attach a rubber cap you can create a makeshift pressure release valve. This way if the co2 does get backed up the cap will blow off releasing the pressure rather than blowing your tubing (or worse). Should be pretty easy to implement in a DIY system that is already established. Just cut your tubing and insert the tee valbe.

Another thing I found was a different way to diffuse the co2 in your water. Using a cheap water pump, connect the pump (with a prefilter) to a cheap gravel vacuum (the plastic tube). This will force the water to mix with the co2 while also preventing the gas from escaping. It also suggests using an airstone at the end of your tubing, but these will likely degrade pretty fast.

Here's the source I was reading.

If you're looking just to increase the flow, slap another generator on there.
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post #14 of 16 Old 07-18-2008, 11:46 PM
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You can also use an air pump with an airstone in your tank to bleed off excess co2. Some people run them for a few hours at night on a timer. The only time I've been concerned about too much co2 in the tank is during the first 24 to 48 hours of adding the yeast to the mixture. This is the time when the yeast is the most active. So to bring the levels down a tad I have turned on the airstone for a few hours at night. Just be careful about messing with the co2 levels too much, as large changes in co2 can cause large PH swings which might affect any fish you have (if any). After 48 hrs the flow of co2 becomes rather stable for about two weeks.

If you find that after 48 hrs the co2 is still bubbling in too fast then make a mixture with less yeast. Less yeast = less co2 production. One bubble every 3-4 seconds seems like a good start point. It will take some experimenting to find the right receipe for your tank.

But what ever you do, NEVER EVER restrict or shut off the outlet tube of your DIY co2 generator! KABOOM! A blow off device is a good idea, but again, it will take some experimenting to find the right blow off pressure.

Good Luck!
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post #15 of 16 Old 07-19-2008, 12:01 AM
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Absolutely Doug. Even just restricting the flow could result in disaster. As kids we used to take the heater powder from my dads old MRE's and throw them in a 2 liter bottle with some water and shake it up. As you said...KABOOM! The same effect would happen with the co2 if the flow is stopped.
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post #16 of 16 Old 10-07-2008, 09:34 PM
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While I do agree that stopping the CO2 flow COULD be bad, I had used control valves on my DIY for YEARS, and I have NEVER had anything explode. I would agree with you that you shouldnt restrict the flow, but I personally have never had any such problems.
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