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I've been wondering for some time whether it might be possible to adapt an Eheim Professional cannister filter in some way to remove the necessity of an in-line reactor. I'll have to look at a 2229.

Andrew Cribb
 

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A nice idea if you already have one but that's an expensive CO2 reactor if you had to buy one for the purpose. I don't know about you guys but I haven't noticed any difference what so ever between an inline reactor and feeding directly into a canister, my CO2 levels remained identical regardless of which method I tried.

Giancarlo
 

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gpodio said:
I don't know about you guys but I haven't noticed any difference what so ever between an inline reactor and feeding directly into a canister, my CO2 levels remained identical regardless of which method I tried.

Giancarlo
But isn't there a risk of C02 gas getting trapped in the impellor, causing it to run "dry"?
 

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I guess there is if your canister is prone to this. I'm using Eheims and I've yet to see one airlock, even the very old ones expell trapped gas very well. I did have an old fluval that did airlock on me and needed a little pat on the back to burp air out after servicing but I'm sure the new models (rectangular ones) have solved this problem. Using pre-filters on my canisters I get a lot of gas pulled out of the water from the negative pressure inside the canister when the pre-filter is getting clogged, it really puts the anti air-lock route to the test and the Eheims have yet to fail. The only problem I've had is when disconnecting the canister for a long time the intake tube gets filled with gas and looses syphon, obviously this isn't something that would happen during operation so it's not really a problem.

I have no experience with other canisters but I haven't heard any complaints and I know many people inject CO2 directly into their canisters.

Hope that helps
Giancarlo
 

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Discussion Starter · #6 ·
The Eheim Model 2227 has a special chamber for the gas, so that there is no chance of breaking the impeller.
 

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Discussion Starter · #8 ·
So you would connect the Co2 to the breathing tube (3rd tube). The only thing I don't think I would like is that I think the cannister creates a wave like motion from the chamber filling up and emptying. I don't know if it would be neat, or a distraction having your plants swaying back and forth.
 

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Since I have the 2229, I posted these questions on TPT, since there are at least two people there that have done it.:

1) Does the cannister still cycle? I thought you might need some sort of bladder to act as a lung to accomidate the pressure changes to allow it fill /empty?

2) CO2 loss through the Eheim input tube. Did you run the C02 tubing directly to the cannister, (with a one way valve?)

3) If it does not cycle, do you get occasional 'burps' coming through? If not, I would think it would be a fairly efficent reactor.

4) I ask, because if this does not work, I would be forced to get either a 2228 or ebay clone, and an additional reactor. I may need the additional cannister anyway for circulation/filtration on a 90 anyway. I just thought that
using the 2229 as a reactor may be an elegant solution.

5) If it does cycle, does the bubble counter not remain constant? I envision it going nuts when the cannister is evacuating water, and creating a low pressure, and slowing way down when the cannister is filling with water, and having to act against the pressure of that.

Oh, I read that CO2 gas, over time, hardens plastic. Would this be a concern to any of you reacting in your expensive Ehiem.



No one had a response.

When I plug up the breather, the filter does not cycle anymore. It still will probably work as a reactor.
I wonder how much CO2 it will burn off if I use it conventionally, and use the reactor I just bought at GG?
If a balloon would not be so CO2 porus, I would thiink it would be a great solution, it could expand and contract with the breathing cycle.

Maybe in this application the cycle is not so important anyway...

Peter
 

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I can't answer your questions regarding the wet/dry 2229, but I can answer your other questions.

You're better off buying the 2228 than wasting your money on a wet/dry, after all you're setting up a planted tank and you wouldn't waves going through your tank. That would basically let C02 dissipate even faster. Plus, wet/dry's don't provide effecient mechanical filtiration and they're expensive. I suggest you use the 2228 with an inline reactor or you can simply inject C02 into the canister as Gian suggested.

BTW, where'd you get a 2228 from? I thought they don't make them anymore, or at least that's what I thought since I never saw one anywhere. :?
 

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I would not be wasting any money, I already have a 2229, for the last three years or so. Excellent filter. I have it on a heavy stocked 55, and it eats up the pollution!

The wave is a misnomer. There is none, the spray bar is below the surface of the tank. On a 55, it changes the level about 1/32 of an inch on a cycle. But you can set it up depending on your taste so that the spray bar sprays on the drain cycle by setting it up above the water level.

I bought a ehiem clone on fleabay. Still waiting for it to arrive. No 2228, although I have seen a few show up on ebay.
 
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