Re: [AGA Member] CO2 concentration in Hard water

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

Thank you so much Erik!
My LAST question (I promise...) is that plants do fine in hard water - From
my experience...
Would plants, although doing fine in hard water, would do better in softer
water ???
Does any physiological/botanical process are processed better in soft water
?
10x again

Amit

----- Original Message ----- 
From: "Erik Olson" <erik@thekrib.com>
To: <aga-member@thekrib.com>
Sent: Monday, November 10, 2003 5:34 PM
Subject: Re: [AGA Member] CO2 concentration in Hard water


> On Mon, 10 Nov 2003, Amit Brucker wrote:
>
> > So is using more CO2 to
> > > > hold that pH range if the KH is high is correct ???
> > Also as the 'I think what Red Sea is saying is that *IF* you limit
> > > > > yourself to pH values' as well ???
>
> > Hope I am starting to understand something here... what would be the
case
> > where the KH is low ????
>
> If you start from the concept that KH and CO2 are independent of each
> other, but help determine pH of the water, you can get everywhere else
> from there, including Red Sea's somewhat misleading statements.
>
> Lower KH  -> lower pH
> Higher KH -> higher pH
> Lower CO2 -> higher pH
> Higher CO2-> lower pH
>
> But as Roger noted, increasing KH doesn't really induce an "ability to
> absorb more CO2", just means that if you're shooting for a particular
> desired pH, it will take more CO2 to do so than at a lower KH.  But you
> would have to physically crank up the injection rate to keep the same pH.
>
> Now, if the KH is ridiculously low (like < 1 degree sometimes in our water
> here in Seattle), then there is so little buffering capacity that the pH
> tends to swing kinda wildly with the amount of CO2 (as well as other acids
> and bases from the fish waste).  But of course, at that KH, the water is
> already below 7.0 when it comes out of the tap, not particularly good for
> plants.  I *have* to add calcium and mag carbonate just to keep things
> stable.
>
>   - Erik
>
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