Problem with inline co2 - The Planted Tank Forum
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post #1 of 5 (permalink) Old 03-11-2005, 12:52 AM Thread Starter
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Unhappy Problem with inline co2

I custom built an inline co2 reactor at the end of my
plumbing before outflow into the tank. It is mounted
vertically beneath the tank. The water flow from
the canister filter comes through the bottom out the
top. The airline barb is on the lower section of the
reactor (pvc pipe). I am using diy yeast method w/
six bottles on an airline manifold then to the check
valve then into the reactor. my problem is I get water
back flow into the airline, which then fills the check
valve and slowly moves past it. I am wondering if I am
not getting enough pressure to fight the water pressure
into the reactor. Should I mount the airline high and
plumb the water from top to bottom then into the tank
or is there some other problem?
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post #2 of 5 (permalink) Old 03-11-2005, 01:10 AM
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I think you've got three problems...
1) you typically want the water flow from top to bottom, so your flow is fighting against the bubbles flowing upward, improving your CO2 absorbsion rate.
2) Your check valve is not doing it's job. If it's not holding back the water, you need a new (better) check valve.
3) If you can't fight back the water pressure, you would seem to have very little pressure from your CO2. Time to check that CO2, I assume DIY, or pressure should not be a problem.

But maybe someone with more experience with DIY CO2 can speak to that...

Steve - 33g reef and a 180g planted in need of a re-scape.
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post #3 of 5 (permalink) Old 03-11-2005, 01:20 AM
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I don't know if you can generate enough pressure with DIY to aid that, but I would think that putting the input at the top would help a bit.
But, with 6 bottles going, it does sound like something is leaking.
Check for leaks, check the check's - make sure the one you have is working properly, or, at their price, just replace it.

I never ran mine without pressurized, but based on the angle @20deg, I don't think much water would get out the fitting into the CO2 line...

From filter output, reactor input is at top (Hose attached), output is on bottom, CO2 near top (black fitting)

You can get a look at it all attached here: (Warning >100k image!)

Based on plans found here (Thanks for the plans!):

BTW - 6 tanks! What is your tank size and KH/pH!?

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post #4 of 5 (permalink) Old 03-11-2005, 01:41 AM
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I dont know if you will be able to use DIY CO2 with a reactor. A better method in order to maintain the diy status would be to tap the line into a power head intake so the impellar turns your tank into a less efficient reactor. I have always had a tough time getting enough PSI out of diy with yeast to pass a check valve effectively...much less to fight the pressure caused by the water flow from your filter. just my 2cents

Planted tanks are all about shrimp.
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post #5 of 5 (permalink) Old 03-11-2005, 11:11 AM
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Just curious... "six bottles" in your DIY setup?

Wow the most I've ever heard of is 2.

How big is your tank? If it's so big that you need 6 bottles for it maybe you should look into going pressurized anyway.
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