Forced Pressure CO2 generator - The Planted Tank Forum
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post #1 of 16 (permalink) Old 04-19-2016, 04:53 PM Thread Starter
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Forced Pressure CO2 generator

I have this hooked up and running on my 40 gallon planted tank. I used native plants of South Carolina and everything is in the beginning phase. Filter has yet to kick in, just thought you all might want to see what I've done.

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post #2 of 16 (permalink) Old 04-20-2016, 07:12 PM
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This looks interesting, a different way to pressurize DIY CO2. Could you explain how it works? The sketch isn't that clear to me.
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post #3 of 16 (permalink) Old 04-21-2016, 10:46 AM Thread Starter
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Im using a small 10g rated air pump which has been sealed with silicone entirely. I then drilled a hole through the case in which I attached a silicone tube. All of the incoming air is forced through the tubing. Tested this by observing the out put when closing the intake tubing. The yeast/sugar bottles are attached with a check valve. There is constant flow of air through out the tubing. When the valves ae closed the co2 will collect in the liquid / air seperator and will then be pumped into the tank so there is minimal loss of CO2.

I'll try and take a pic of the final rig when I chane yeast / sugar bottle.
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post #4 of 16 (permalink) Old 04-21-2016, 12:38 PM
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Wouldn't this be gassing out a bunch of air along with the CO2? Possibly off gassing the CO2 you are putting in.
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post #5 of 16 (permalink) Old 04-21-2016, 12:47 PM
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Ph readings could answer that. Interesting concept nonetheless.
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post #6 of 16 (permalink) Old 04-21-2016, 01:31 PM Thread Starter
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There is the possibility of off gassing but its the same risk as using a CO2 diffuser. Having the outlet placed right under the in flow from the (over the back) filter drives the bubbles back into the water, which circulate around the tank nicely.

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post #7 of 16 (permalink) Old 04-21-2016, 01:40 PM
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Isn't this overly complicated? Would pressure from the CO2 chambers push CO2 into the outlet? What's the need for the pump?
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post #8 of 16 (permalink) Old 04-21-2016, 02:07 PM Thread Starter
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The pump allows for forcing the air/co2 through a small orifice to form smaller bubbles. The rig also conserves co2 in the off position. It increases pressure with in the tubing to allow for an increase in depth in your aquarium. I got the air stone sitting at an 18 inch depth with in the tank. More contact time with the water the more the co2 will have to dissolve. CO2 dissolves 200 times more readily than O2.

It really was simple to put together, about 20 minutes.

The air stone is not a stone but a 2mm ID piece of styrene tubing. One end was melted together and then holes were pierced using a 22 gauge needle.
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post #9 of 16 (permalink) Old 04-21-2016, 02:29 PM
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I have a hard time with leaks sometimes with a straight pipe from my sugar bottle to my ladder (yeah, I'm old school).
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post #10 of 16 (permalink) Old 04-30-2016, 02:16 PM Thread Starter
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Here is some pics of the connections and reactor vessels. Didn't take the air compressor out of the cabinet, to hard to re run the tubing and wires.
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post #11 of 16 (permalink) Old 05-04-2016, 07:58 PM Thread Starter
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Thought I would redo the pic as the other was really hard to read if anyone is interested..
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post #12 of 16 (permalink) Old 05-09-2016, 11:37 PM
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Quote:
Originally Posted by MCSLABS View Post
I have this hooked up and running on my 40 gallon planted tank. I used native plants of South Carolina and everything is in the beginning phase. Filter has yet to kick in, just thought you all might want to see what I've done.

PDF attached
So to reduce the complexity of this setup, you may want to look at a DIY citric acid and baking soda CO2 generator. I've been using that and its a self-pressurized system. Meaning it produces quite a bit of pressure and works instantly after you mix water in instead of having to wait a day or however long for the yeast/sugar mix to start producing CO2. There is quite enough pressure to push through a diffuser or use a ladder diffuser like I am to increase the efficiency of the CO2 dissolving into the water.

DIY CO2 Setup with Citric Acid/Baking Soda

Ladder Diffuser
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post #13 of 16 (permalink) Old 05-09-2016, 11:56 PM Thread Starter
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Quote:
Originally Posted by No.92 View Post
So to reduce the complexity of this setup, you may want to look at a DIY citric acid and baking soda CO2 generator. I've been using that and its a self-pressurized system. Meaning it produces quite a bit of pressure and works instantly after you mix water in instead of having to wait a day or however long for the yeast/sugar mix to start producing CO2. There is quite enough pressure to push through a diffuser or use a ladder diffuser like I am to increase the efficiency of the CO2 dissolving into the water.

DIY CO2 Setup with Citric Acid/Baking Soda

Ladder Diffuser
I've looked at those systems and even have a 5 pound container of citric acid in the lab just sitting there. I may go that route at some point. thanks for the link

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post #14 of 16 (permalink) Old 05-10-2016, 12:21 AM
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I've looked at those systems and even have a 5 pound container of citric acid in the lab just sitting there. I may go that route at some point. thanks for the link
No worries. This is my first DIY CO2 system and after doing some research it sounded like the best option. Instant pressure and no smell I guess? After following the recipe found in my DIY kit, it lasted me 11 days running 24/7 at pretty much 1-2 bps. I have a 125 gallon tank so it did not gas the fish. I probably don't have it high enough either which I will experiment with. I'm trying to double my duration by doubling the ingredients. Will see how that goes.
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post #15 of 16 (permalink) Old 05-10-2016, 02:12 AM
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Your co2 generators appear to be made of glass. People have blown these up, even without trying to store it up overnight, I would recommend 2 liter bottles or such.

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