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[APD] RE: Aquatic-Plants Digest, Vol 4, Issue 6

If the C02 level doesn't change when changing the KH, then the KH only
effects the pH. I'm understanding from this, that if you have water with a
certain KH, it will always have the same pH (assuming no C02 injection). So,
if you have no C02 injection you only need to have one test kit - either a
KH or pH - and just read off the missing parameter from the chart? That
doesn't work because you need to know the C02 level as well. Is there a
standard level of C02 for a body of water with no injection at a specific
temperature? From what I've read before other factors influence the chart
such as phosphates, tannic acids from bogwood etc. Is the chart that
reliable in a real tank scenario?


> -----Original Message-----
> Date: Tue, 02 Dec 2003 21:31:55 -0700
> From: Chuck Gadd <cgadd at cfxc_com>
> Subject: Re: [APD] Re: PH and CO2 questions
> To: aquatic plants digest <aquatic-plants at actwin_com>
> Clint Brearley wrote:
> > Tarah Nyberg wrote
> >>However, In order to reduce the net amout of CO2 that you 
> need for you
> >>plants you can also reduce the KH. at a KH of 2-3, 
> (36-50ppm) you will
> >>need much less CO2 to keep your plants happy. I don't have the chart
> >>handy, but this should be evident from the chart. 
> > 
> > What? This doesn't make sense to me. Why should the KH have 
> any influence 
>  > on how much CO2 the plants need? Lowering KH will just 
> lower pH (if CO2
>  > stays contstant) but have no effect on CO2 or the plants 
> CO2 requirements.
> You are exactly correct Clint.
> Regardless of what your KH is, you need to inject the same amount of
> CO2.  Changing the KH only changes the pH at a given CO2 level.  And
> we know that pH isn't what's important to the plants.
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