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Re: CO2 systems
- To: Aquatic-Plants at actwin_com
- Subject: Re: CO2 systems
- From: Chuck Gadd <cgadd at cfxc_com>
- Date: Fri, 15 Sep 2000 02:19:45 -0600
- Delivered-To: fixup-Aquatic-Plants at actwin_com@fixme
- References: <200009150748.DAA02756 at actwin_com>
Mark Gilmore wrote:
> I stand corrected. My systems maintain pH = 6.8 at kH = 4. With much
> harder water you would have a damped system that could run stably open
> loop, as you say. (Of course I DO know this.).
> I think this essentially adds to my point, however. If you are trying to
> maintain stable pH/CO2 open loop and are having trouble, then you do NOT
> have a heavily damped system, and a closed loop system (pH controller) is
Again, I disagree. A higher KH doesn't change the size of any pH swings.
It just moves the hi and low points, the size of the swing will be unchanged.
KH doesn't "damp" anything.
I would completely agree that a pH controller is needed if we couldn't
control the CO2 gas pressure. But that's what the regulator (and
needle valve) is for.