Help! DIY generator producing bubbles, but none in the tank - The Planted Tank Forum
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post #1 of 3 (permalink) Old 08-09-2018, 10:46 PM Thread Starter
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Help! DIY generator producing bubbles, but none in the tank


I recently tried using a DIY CO2 generator that I made out of airline tubing, a 1 gallon milk jug, and a yeast/baking soda/water solution. I used

1. Tablespoon yeast
2. 2 cups sugar
3. 1 pinch baking soda

However, a few days after setting up, I see a lot of bubbles rising to the surface of the jug, which I presume to be a sign that CO2 production is happening, but I see no bubbles coming out of the end of the airline tubing in the tank. I don't think there are any leaks (I don't hear any). I do see that sometimes a little yeast-sugarwater solution is expelled out of the jug and accumulates here and there in the airline tubing. What is the issue and how can I solve it?


Sean B
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post #2 of 3 (permalink) Old 08-16-2018, 09:34 PM
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Are you still working on trying to get this working? I've just started one myself. I think seeing the solution in your tubing is not a good sign. Was it condensation or is the mixture close to the top of the bottle?
When I first got mine going yesterday it took a while to get the system pressurized to the point gasses would get pushed down tubing. I noticed that the further down you put the end of the tubing down the tank the longer it takes for you to see bubbles. And I would imagine if you go down far enough there may not be enough pressure to see bubbles in a DIY set up.
Anyway, I was seeing if you are still experimenting and maybe wanted to compare notes.

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post #3 of 3 (permalink) Old 08-17-2018, 02:25 AM
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Hi Blue Velvet
Two possible issues, or not enough CO2 pressure or you have a leak.
I will switch that milk container to soda bottle, it's designed to withstand pressure :
Here is a very good guide on how to setup DIY CO2:

Beginner's Guide to CO2 Injection in the Planted Tank - Aquarium Advice

Good luck
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