[APD] My tank water doesn't match the tap water

[Barry Anderberg <apd at swoobs_org>]

I noticed that my tank water's KH is 24 dH and my tap water is 20 dH.

Another thing I found was that my tap's pH is about 7.5 meaning I have 
about 19 ppm of CO2 right out of the tap.

Putting the water in a bucket with an airstone for a few hours confirmed 
this as the pH of that water went up to near 8.0.

I have nothing in my tank that would contribute to carbonate hardness.  
At present it contains silica sand, three pieces of driftwood, four fake 
plants, and a crappy "Whisper" brand heater which seems to have melted 
some of the silica sand when it was closer to the bottom of the tank.  
How that's possible at 80F is anyone's guess..

 I guess I would like to know if others routinely experience a change in 
KH from tap to tank, what could be causing it, and also if it is 
possible and/or common to see 19 ppm of CO2 in tap water.

Thanks.


Barry Anderberg wrote:
> I am amazed at the fact that we are able to send human beings into outer 
> space, split the atom, and uncover the secret laws of the universe, and 
> yet we cannot figure out why algae grows or doesn't grow in a planted 
> aquarium.
>
> I find that a little hard to swallow, especially given all the people in 
> the world with degrees in botany and plant biology, etc., etc.  People 
> in the planted tank community may not have unraveled the mysteries of 
> algae but I'm pretty sure someone somewhere knows exactly what makes 
> algae grow, or not.  I think.
>
> -Barry
>
> Liz Wilhite wrote:
>   
>> On 1/29/06, Jerry Baker <jerry at bakerweb_biz> wrote:
>>   
>>     
>>> S. Hieber wrote:
>>>
>>> Agreed. The fact that there are so many ways to successfully grow plants
>>> says to me that there is a lot we don't know. There is an objective
>>> truth out there -- a recipe guaranteed to grow plants well and algae not
>>> so well. The problem is we don't yet know enough to say exactly what
>>> that recipe is.
>>>     
>>>       
>> I disagree.  I think there are many recipes out there for what works.  There
>> are many balance points.
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>>     
>
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