Citric acit - Baking soda Co2 - Pressure dropping - The Planted Tank Forum
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post #1 of 2 (permalink) Old 02-11-2019, 10:30 AM Thread Starter
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Citric acit - Baking soda Co2 - Pressure dropping

I have Citric acit - Baking soda co2 kit. it is standard D-201 - link at the end. After I set it up, about 1 hour later it slows down and finally stops bubbling. Then I readjust the needle valve, and it stops again about one hour later again. I couldn't find any leak. in fact I removed it from the tank and put the pipe end to a bucket.

There is no backpressure diffuser vise etc.. just end pipe to a bucket. And it stops in there too. I don't get it. My pressure gauge remains stable. So I thought there is a leak in the pipe or needle valve but it seems there is not. How is this possible I really don't get the physics of it. There is almost no backpressure Anyone has opinion ?
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post #2 of 2 (permalink) Old 04-26-2019, 05:53 PM
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There are so many variables here its hard to tell excatly whats going on but, the reaction that produces co2 is rather fast, so it will stop quickly. All that is left is the co2 in your bottle, unless its highly pressurized (a standard soda bottle takes about 100psi before bursting) thats not a big amount of co2.

So if there is no bubbeling and the bottle is soft, the reaction has stopped and there is no more co2.

The reason most don't use this as it will only work with very small tanks. As the co2 produced and stored in the bottle is all you have to work with. It could work if you used some chemistry to determine how much baking soda and citric acid you need to produce a spesific amount of co2. Then use those numbers, and make a device that will add more reactants when the reaction stops. This is gonne be very complex and probably more expensive than a regulare pressurized co2 setup.

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