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RE: Aquatic Plants Digest V4 #1610
- To: <Aquatic-Plants at actwin_com>
- Subject: RE: Aquatic Plants Digest V4 #1610
- From: "Gregory Gooden (Annex)" <ggooden at exc1_annex.com>
- Date: Sun, 17 Feb 2002 16:15:17 -0800
- Thread-Index: AcG00kfPmnGdQVslSuaxFgXX3kBimwDPNMyg
- Thread-Topic: Aquatic Plants Digest V4 #1610
Thanks Roger!
I'm going to see if I can maybe slow down the rate of flow and check out
Tom's external reactor stuff (previous posting)... I've got good covers
on the sump, but I suspect I could seal it even better.. :)
Gregoyr
> Date: Wed, 13 Feb 2002 12:12:15 -0800
> From: "Roger Gordon" <rgordon at tns_net>
> Subject: Re: Aquatic Plants Digest V4 #1609 CO2 in Sump
>
> Dear Greg,
>
> I have a wet/dry on my 100 gallon tank. I inject CO2 via an
> Eheim diffuser in the wet/dry. Initially, I had the diffuser
> in the half of the wet/dry that held the bio balls. That
> made cleaning the top of the diffuser very difficult so I
> eventually moved it to the sump portion of the wet/dry. I
> have tight lids on the top of the wet/dry so that the CO2
> that is not immediately absorbed in the water stays trapped
> in the wet/dry to be absorbed as the water tumbles through
> the wet/dry. What I have found critical to maintaining high
> CO2 levels in my system is controlling the rate of flow
> through the wet/dry filter. Even though I have the return
> spray bars under water, if the rate of flow through the
> wet/dry exceeds a certain rate, the CO2 is driven off very
> quickly. Surface agitation is one factor that drives off
> CO2. With the return bars under the water that is not too
> much of a problem except at maximum flow rates. However, in
> my system, whether the water flows smoothly and quietly into
> the built-in prefilter box or cascades loudly into the
> prefilter box makes a big difference in the CO2 level.
> Apparently, the water cascading into the prefilter box drives
> off the CO2.
>
> To control the rate of flow through the wet/dry I have a ball
> valve after the Eheim 1060 hobby pump which I use as the
> return pump. The Eheim can have its current flow restricted
> without any reliability problems. Not all pumps are built that way.
>
> By reducing the flow of water through the wet/dry I keep the
> water level in the wet/dry at least 12" deep (which allows
> better absorption of the tiny bubbles from the diffuser) and
> I also minimize the CO2 lost due to surface agitation and
> prefilter tumble.
>
> Try reducing your rate of flow. It works for me.
>
> Best Regards,
>
> Roger Gordon
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