Re: [APD] CO2 and pH control

[Gordon and Susan Watkins <gwatkins at ritternet_com>]

Thanks for the in-depth information George. So where do you currently 
stand on the impact of trickle filters on CO2 efficiency?

Gordon Watkins

gbooth at frii_com wrote:

>>Date: Tue, 13 Dec 2005 07:54:34 -0800
>>From: Jerry Baker <jerry at bakerweb_biz>
>>Subject: Re: [APD] CO2 and pH control
>>To: aquatic plants digest <aquatic-plants at actwin_com>
>>
>>Gordon and Susan Watkins wrote:
>>    
>>
>>>Nope, after 20+ hours it still shows 8.6
>>>      
>>>
>>If your pH test is correct, and there are no other buffers in your water
>>aside from carbonates, then your KH is around 40, not 9. I would be more
>>inclined to believe that there are additional buffers, but I'm not sure
>>what other buffers would increase the pH like that.
>>    
>>
>
>There are two equilibrium dissociation constants when carbonates are in he
>water, around pH 6.4 (bicarbonates) and around 10.2 (carbonates). My guess
>is that Gordon's water has lots of carbonates and that the "normal"
>pH/KH/CO2 table does not apply.
>
>See http://faq.thekrib.com/Annex/oldfaq-hardness.txt for details but don't
>ask me to explain it even though I authored it.
>
>George B.
>
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>  
>
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