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Re: [APD] phosphates and co2 table



But the fly in the ointment is the water company.  They can add lots of 
different things to the water without saying anything about it, change 
what they add with no notice, and get the water from a different source 
depending on availability and season, etc.  And, all of those things 
can cause the phosphate level in the water to change.  You can get a 
report from them about what is typically in the water, and compensate 
for that, or you can just forget "measuring" CO2 and add as much as you 
can without adversely affecting your fish.  I like the latter approach.

Another option is to measure the KH and PH of a tank sample of water 
after it sits overnight in a cup on the kitchen counter, and comparing 
that to the normal, CO2 injected water in the tank during the daytime.  
Assuming the KH is the same for both measurements, the difference in PH 
should be about 1.0 if you have 30 ppm or so CO2 in the water.  (I 
don't know if this is really true, but it seems to be reasonably true 
when I try it.)

Vaughn  H.

On Tuesday, March 7, 2006, at 04:20 AM, S. Hieber wrote:

> If you want to lower pH a little, adding CO2 will do that since a 
> small portion of the CO2 you add forms with water maolecules to make a 
> weak acid called carbonic acid., Carbonic acid reacts with carbonates, 
> thereby lowering the KH ever so slightly. KH raises the pH. So if you 
> know the KH and pH, you can extrapolate the CO2 level, which is what 
> the table presents.  Some phosphate compounds muck that up. But you 
> can skip the phosphate-based conditioner and use a carbonate if you 
> wanted to add a pH buffer or raiset he pH. Baking soda, for example 
> works fine for this purpose.
>
> sh
>
> * * * * * * * * * * *
> The Northeast Council of Aquarium Societies (NEC) celebrates its 50th 
> year of service at its 31st annual convention, April 7-9, 2006 -- 
> including *An Evening with Aquarium Legends*.
>
> Read the speaker list, then download the registration form, and get 
> set to join the fun at what promises to be the year's biggest tropical 
> fish convention.
>
> http://northeastcouncil.org/html/
>
> And while you're there, attend the AGA's annual meeting Friday 
> afternoon (2-4pm). This year's speaker is Claus Christensen, Tropica's 
> Managing Director.
>
>
> ----- Original Message ----
> From: Joel Fizette <sentientpuppet at gmail_com>
> To: aquatic plants digest <aquatic-plants at actwin_com>
> Sent: Tuesday, March 7, 2006 1:42:15 AM
> Subject: Re: [APD] phosphates and co2 table
>
>
> ok I don't have a TDS meter nor the money to buy one right now so what
> exactly AM I supposed to do... I've been reading so many conflicting
> viewpoints its kinda frustrating... I have been coming across this 
> point
> about how pH doesn't really matter to the fish but the rest of the 
> world
> seems to think it does. Like what about how people are always talking 
> about
> how certain fish "like" a certain pH level? What your saying is that 
> they
> like a certain osmotic pressure? Which is somehow related to the 
> hardness of
> the water?
>
> On 3/6/06, Jerry Baker <jerry at bakerweb_biz> wrote:
>>
>> Jerry Baker wrote:
>>> My understanding is that the phosphate interferes with the reaction 
>>> of
>>> CO2 and water.
>>
>> I should have said interferes with KH readings. In your case KH tests
>> will show a higher value than you actually have because they will be
>> measuring the phosphate also.
>>
>> --
>> Jerry Baker
>> _______________________________________________
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>> Aquatic-Plants at actwin_com
>> http://www.actwin.com/mailman/listinfo/aquatic-plants
>>
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