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- To: <Aquatic-Plants at actwin_com>
- Subject: Re: pH<7
- From: Thomas Barr <tcbiii at earthlink_net>
- Date: Tue, 16 Jul 2002 15:49:48 -0700
- In-reply-to: <200207161948.g6GJm1A10015 at acme_actwin.com>
- User-agent: Microsoft-Outlook-Express-Macintosh-Edition/5.02.2022
>> CO2 levels are determined by both pH and KH (refer to the table).
> This is backwards. The pH is set by the CO2 concentration
> and the KH. You can find out what the CO2 concentration is by measuring
> the pH and KH. You can only adjust it by altering the CO2 system or
> the plants or fish or lighting.
It is backwards. I should have said measured, not determined.
>> Water with high KH values(HCO3) at equilibrium (like a glass of it sitting
>> on the table for 24 hrs say) has less CO2 and more HCO3 than water with low
>> KH values.
> It will have the _same_ amount of CO2.
Ah, I got that one tangled up:) They do have the same CO2. Slap my face. I
actually deserve it here.
> The equilibrium concentration
> of CO2 in the water is _not_ affected by KH.
>> Some folks don't use CO2, some plants and all algae use HCO3 instead of CO2
>> as a carbon source splitting it HCO3=> CO2+ OH. This raises the pH and also
>> softens the water(Removes the KH).
>> Soft water(in terms of KH) has more CO2 than hard water does at
> No, this is not true.
> The CO2 concentration is dependent on the CO2 system, the fish,
> and the plants, but _not_ the KH. The CO2 concentration and the KH set
> the pH.
Again thanks Paul, I'm wrong here. I didn't think it through and fired off
> - --
> Paul Sears Ottawa, Canada