Re: pH/heavy metals (was) Re: [GSAS-Member] Free fish food, or trade

[Erik Olson <erik@thekrib.com>]

On Fri, 25 Feb 2005, it was written:

> On another note, as I understand it, pH and hardness are separate measures. 
> Are there any fish
> that prefer alkaline water that is soft, or is in nature alkaline water 
> always hard?

Though pH and hardness are separate measures, they're not really 
indepentend.  Hardness influences pH.  Alkaline water is normally 
inherently hard, as it's the hardness (in particular, dissolved 
carbonates) that raises pH.

By contrast, though, acidic water can be soft AND it can also be hard 
water with a lot of CO2 dissolved in it.  Think seltzer water.  Lots of 
minerals, but acidic.

  - Erik

--
Erik Olson
erik at thekrib dot com
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