Re: [AGA Member] CO2 efficiency in hard water

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

Scott,
Thanks for the answears.
Let me make myself clear a bit more,
If I'll take out my CO2 system - I am not sure it will effect the plants
much.
Assuming that my PH/KH are stable at all times - this means I'll have stable
amounts of dissolved CO2 ?
Is this also may be the reason for not seeing to much CO2 diffusion in the
water ???
Sure I know that CO2 is one of the three important nutrient, but my tap
water seems to have fair amount of it considering KH&KH....
So it seem to my that my system does not contribute too much for my tank.
Now ask this: Ok, stop using the CO2 system. Lets consider plants taking up
all CO2 in the water, what then ?
1. I don't think this should have any effect on PH and not I don't think PH
levels would rise.
2. The tank is aerated during the night - I  guess that some CO2 enters the
tank as well.

What do you think ?
10x

Amit
----- Original Message ----- 
From: "S. Hieber" <shieber@yahoo.com>
To: <aga-member@thekrib.com>
Sent: Saturday, April 24, 2004 2:08 PM
Subject: Re: [AGA Member] CO2 efficiency in hard water


> These seem pretty straightforward questins, so I'll take a
> turn at them:
>
> > Questions:
> > 1. Does a CO2 system is actually needed in hard water,
> > assuming water is
> > replaced every 2 weeks and water parameters will not
> > really change. PH is
> > rather stable.
>
> IN a planted tank the CO2 is a nutrient for the plants,
> it's presence has little to do with water hardness.
>
> > 2. Should I target to higher levels of CO2? (well ph will
> > slightly drop and
> > my crypts will melt...)
>
> 23 ppm should be a nice level of CO2.
>
> > 3. Does any of the other parameters in hard water can
> > effect the CO2
> > dissolved levels ?
>
> NO, for an aquatic gardener's intents and purpose no
> hardness or carbonate parameters affect the amount of CO2
> in the water. What they affect is the pH which can throw
> off the reading onthe CO2/KH/pH table.
>
>
> > 4. In hard water levels I know that some plants will have
> > trouble processing
> > the Macro and Micro nutritients.
>
> Question is?
>
> > 5. FE levels are 0 can there be a process which the FE
> > will bind itself to
> > other thing rather than to plants?
>
> It's pretty hard for FE not to be cound to something --
> which is why chelators (binders) are used in FE supplements
> -- because they bind it before other stuff does, but the
> plants can still get it from the chelator.
>
> Does your test only test for free FE? You probably want a
> test kit that can measure accurately with a range that
> maxes out about about 1 ppm. If the plants are not showing
> iron deficiency symptoms, forget about the iron levels and
> think nice thoughts instead, the iron is fine.
>
> > 6. Is it correct to link between CO2 levels and hard
> > water or should I look
> > for a new direction?
>
> Only a small percentage of CO2 in the water forms carbonic
> acid so only a very small amount can react with carbonates.
> The more carbonate, the more CO2 reacting with the
> carbonate--to that extent carbonate levels can affect CO2
> levels. *However* in the overall picture, that effect is
> negligible. CO2 level is essentially a matter of how much
> you pump into the water, how fast the water is shedding the
> gas, and water temp, which affects how much the water will
> hold.
>
> sh
>
> =====
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>
>
>
>
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