Re: [AGA Member] Water question..

["Amit Brucker" <amitb@gtek.co.il>]

Well I do not disagree.
But I think there is a linear connection of high KH that may hold larger
amount of CO2 than Lower KH levels.
Not saying that these two are combined in this way or another.
And since my water are hard, I think I'll stick to my current CO2 system
which is only  500 grams bottle and lasting for more than a month by now.
This might change if I'll mix RO water to the tank. So I guess I can
continue use my CO2 for my 100 gallon planted tank.
Now everyone is claming that plants do well in hard water - I agree also but
will they do better in softer water with an additional CO2 and nutrients?
Sorry for being such a nagger....

Amit

----- Original Message ----- 
From: "S. Hieber" <shieber@yahoo.com>
To: <aga-member@thekrib.com>
Sent: Sunday, November 09, 2003 10:09 PM
Subject: Re: [AGA Member] Water question..


> Besides not being a very good typist, I am not a chemist.
> But I think I can help a littel bit here.
>
> CO2 does not affect the KH, nor does KH affect the amount
> of CO2.  They simply have opposite effects on pH, so if you
> know the value of two of the items, you can calculate the
> third, or look it up in the appropriate table. But it seems
> you are getting at something else -- low CO2 causeing
> plants to use up carbonates and thereby decrease KH.
>
> It's true some plants can get carbon from carbonates in the
> water, although I think that those that do, do so when CO2
> is limited. The CO2 is easier for them to process.
>
> The KH in the water can lower if plants are using
> carbonates - vals being one candidate -- but it can also
> rise if the substrate is one that adds to the hardness or
> if you are adding chems that raise the carbonates -- the
> latter apparently not the case for your situation.
>
> But the KH level should not cause the CO2 to be higher or
> lower. So, if you are not injecting CO2, then the KH might
> lower over time, which I gather is what you are getting at.
>
> Basically for the reasons Rachel pointed out, tap water is
> not a good source of CO2 and probably does not factor
> largely into the use of KH.
>
> Chemists, jump in and comment/correct me here.
>
> Scott H.
> --- Amit Brucker <amitb@gtek.co.il> wrote:
> > I know of course that CO2 had a direct effect on PH,
> > However  I am more
> > interested in the connection of KH and CO2, as it seems
> > that high KH levels
> > can contain higher CO2 levels than lower KH levels....
> > And since what effect
> > KH are carbonates and bio carbonates and that plants may
> > use (Maybe I get
> > this one wrong...) I was wondering whether less water
> > changes will lead to
> > decrease in the KH levels as CO2 will drop. (thus while
> > maintaining a stable
> > Ammonia/nitrite levels).
> > Hope I've made my self clear
>
>
> =====
> See you in Dallas at the Aquatic Gardeners Associaton
> 2003 Annual Convention
> Nov 14-16
> S. Hieber
>
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