CO2 diffusion in HOB inlet - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 05-22-2014, 10:18 PM Thread Starter
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CO2 diffusion in HOB inlet

Hi guys,
I know that CO2 in a cartridge filter has many advantages, but what about big the diffusion bubbles run through and HOB via its inlet?

thanks - Todd


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post #2 of 13 (permalink) Old 05-22-2014, 11:23 PM
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I would think it would just gas out since the reason the canister filter works is it is under pressure which helps dissolve the co2.
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post #3 of 13 (permalink) Old 05-22-2014, 11:50 PM
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It's a pretty efficient diffusion method for like a DIY set-up. Im actually doing this on a 20 Gal using an Aquaclear30. The propeller chops up the bubbles, which then get passed through the media, and finally blown all over the tank in a very fine mist.

** Ignore the ghetto-ness, Im just experimenting with this tank



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Last edited by burr740; 05-23-2014 at 12:28 AM. Reason: typo
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post #4 of 13 (permalink) Old 05-23-2014, 04:11 AM Thread Starter
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burr740, I'm wondering after the propeller chops them up and they go through the media if they don't get lost between the media and the waterfall?
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post #5 of 13 (permalink) Old 05-23-2014, 05:17 AM
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I've tried it and it works decently but a lot of the gas escapes before dissolving. I was running a drop in cartridge HOB so there was a lot of escaping. I would assume the HOBs with bottom to top flow would trap the gas while it dissolves.
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post #6 of 13 (permalink) Old 05-23-2014, 05:20 AM
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Quote:
Originally Posted by tjurhs View Post
burr740, I'm wondering after the propeller chops them up and they go through the media if they don't get lost between the media and the waterfall?
My HC says no

First planting -


12 days later -


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post #7 of 13 (permalink) Old 05-23-2014, 05:26 AM
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Quote:
Originally Posted by Solcielo lawrencia View Post
I've tried it and it works decently but a lot of the gas escapes before dissolving. I was running a drop in cartridge HOB so there was a lot of escaping. I would assume the HOBs with bottom to top flow would trap the gas while it dissolves.
Indeed. The media in my Aquaclear goes sponge, sponge, bio. So it has to pass through all that. It actually amounts to a more efficient version of this popular method

https://www.youtube.com/watch?v=2U8G...8&noredirect=1

which uses one of these -

http://www.amazon.com/gp/product/B0009YD7D4/


The only drawback for some people might be the noise. There is a distinct chirp every time a bubble hits, so like 3 every 2 seconds. It's not very loud but you can definitely hear it.


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Last edited by burr740; 05-23-2014 at 05:38 AM. Reason: added link
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post #8 of 13 (permalink) Old 05-23-2014, 05:39 AM
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I currently run the Elite mini filter as the diffuser. The impeller isn't very good at chopping up the gas compared to a Rio powerhead, which is much more efficient.
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post #9 of 13 (permalink) Old 05-23-2014, 05:58 AM
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Originally Posted by Solcielo lawrencia View Post
I currently run the Elite mini filter as the diffuser. The impeller isn't very good at chopping up the gas compared to a Rio powerhead, which is much more efficient.
Using the Rio PH, did you just run a raw, open line into the intake, or did you change something up? Like adapt a sponge filter to the outtake or use an air stone to pre-diffuse


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post #10 of 13 (permalink) Old 05-23-2014, 02:46 PM Thread Starter
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my question is really about if the gas "escapes" getting into the HOB outflow/waterfall after it passes the filters and enters the water.
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post #11 of 13 (permalink) Old 05-23-2014, 07:59 PM
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Quote:
Originally Posted by burr740 View Post
Using the Rio PH, did you just run a raw, open line into the intake, or did you change something up? Like adapt a sponge filter to the outtake or use an air stone to pre-diffuse
Just an airline directly into the intake. It chops it up into very fine bubbles/mist and the turbulence really swirls the gas around that it dissolves pretty quickly. Definitely better than the ceramic diffusers and much quieter than the Elite mini filter.
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post #12 of 13 (permalink) Old 05-23-2014, 08:00 PM
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my question is really about if the gas "escapes" getting into the HOB outflow/waterfall after it passes the filters and enters the water.
No more so than just off-gassing at the surface if it's completely dissolved. If it isn't, then the bubbles are concentrated at the outflow so there will probably be more off-gassing as it exits.
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post #13 of 13 (permalink) Old 05-23-2014, 08:05 PM Thread Starter
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Originally Posted by Solcielo lawrencia View Post
No more so than just off-gassing at the surface if it's completely dissolved. If it isn't, then the bubbles are concentrated at the outflow so there will probably be more off-gassing as it exits.
that's what I thought too
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