DIY CO2 diffuser - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 08-05-2015, 12:36 PM Thread Starter
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DIY CO2 diffuser

Hi all, I have been thinking of starting a CO2 yeast reactor for my plants.
I did one few years back, where i put the CO2 outlet in the venturi device of the power filter; the CO2 levels didnot rise as expected. So, this time I am thinking of something else.
My tank is about 60 gallons (tank height 17 inches) with 160 Watts of LEDs on a 8 hour lighting period. Will 2 x 2Ltr bottles work? The plants I have are easy plants viz. Dwarf Sagittaria, Ejeria Najas, anubias, java fern, java moss, Vallisneria, Ludwigia, parrot feather. So, I won't be needing like 30 ppm CO2, just enough to avoid algae in these lights (and to make the Ludwigia red)

What is the best way to diffuse CO2? I have seen people putting the CO2 pipe in the filter intake sponge, but my sponge becomes clogged every week!
Can yeast CO2 bubble though an airstone with enough pressure? Any other way for maximum diffusion?
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post #2 of 10 (permalink) Old 08-05-2015, 01:58 PM
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airstones apparently disintegrate with CO2, I've only had my setup for a few weeks but the best I've found to work so far is a filter from a cigarette, makes nice tiny bubbles.
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post #3 of 10 (permalink) Old 08-05-2015, 03:13 PM Thread Starter
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Whats a cigarette filter? Is it the unburnt white part of the cigarette?
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post #4 of 10 (permalink) Old 08-05-2015, 03:15 PM
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yup, I just cut that part off, took the paper off and then trimmed the end to fit into the air hose.
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post #5 of 10 (permalink) Old 08-05-2015, 04:00 PM Thread Starter
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Still, how to diffuse the CO2 bubbles in the water?
Also, wikipedia says cigarette filters are toxic in water. Bubbles can also be made by putting a cotton ball in the airline tube.
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post #6 of 10 (permalink) Old 08-05-2015, 04:07 PM
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well you don't take the filter from a used cigarette :P yes you can put a cotton ball in the end that works too.
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post #7 of 10 (permalink) Old 08-05-2015, 07:42 PM
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piece of a chop stick. Once it also gets nice and gunky the bubble get super fine and disperse nicely. Why not make a smaller version of a cerges reactor. I was thinking of trying it with my itty bitty 5 gallon since my bigger tank is going pressurized with a home made cerges (I didnt build it though it came with the setup I bought.
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post #8 of 10 (permalink) Old 08-05-2015, 07:53 PM
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Probably need at least three 2 liters on a 60 gal, changing out 1 per week, or every 5 days. The two right hand links in my sig may offer some additional food for thought.


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post #9 of 10 (permalink) Old 08-11-2015, 10:46 AM Thread Starter
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Just an update: I am using a cigerette butt on the end of CO2 line and it is making a very fine stream of bubbles. I placed the pipe end at the substrate level just below the filter outlet. The filter outlet pushes the bubbles all around the tank! I don't know about the efficiency, but my Ejeria Najas has started sprouting very dense leaf clumps, and the leaves are a bit red.
Also, I still have the venturi pipe at the filter outlet; I just keep the air line under water during day, and pull it up during night.
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post #10 of 10 (permalink) Old 08-11-2015, 01:58 PM
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glad it's working for you
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