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Re: CO2

Then I guess an air pump on a timer might be the best solution after all.

Giancarlo Podio

----- Original Message -----
  a.. To: "Aquatic Plant Digest" <aquatic-plants at actwin_com>
  b.. Subject: Re: CO2
  c.. From: "John T. Fitch" <JTFitch at fitchfamily_com>
  d.. Date: Wed, 12 Feb 2003 10:13:48 -0500
  e.. References: <002401c2d1dc$f5682a50$6401a8c0@main>


> Date: Mon, 10 Feb 2003 16:44:51 -0500
> From: "Giancarlo Podio" <gp at isaconsulting_com>
> Subject: Re: CO2 Level
> Shouldn't a PH probe and controller avoid this from happening? Wouldn't
> just turn the CO2 off at night when the PH dropped to the set value?
> was my understanding of using a PH controller with a CO2 setup. You
> airate or increase surface agitation to release some of the extra CO2 at
> night but I still feel the PH controller should be taking care of this
> you. What am I missing?
> Giancarlo Podio
It's true that the controller turns off the CO2 when the pH drops below
the set value.  But at night, when the plants are putting out CO2 instead
of taking it in, the pH steadily drops.  The controller has no way of
stopping this.

John T. Fitch