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Re: PH adjusting to CO2 and rising again (apd v4 #562)

Carla Thorn asked:
> Has anyone else observed this phenomenon? I use a DIY yeast bottle, and often 
> after the PH is just where I want it, and stays that way for a couple of 
> months (with bottle changes of course), it often rises back up to the old 
> high level again, even though the CO2 remains the same. It's as if the water 
> has adjusted and requires more and more CO2 to keep the PH the same low 
> level. I know there are probably other factors here at work, but what are 
> they?

   In our area the tap water KH varies seasonally, depending on where
the local water authority is getting its water.  Does yours?  They're
very willing to talk to the occasional aquarist here.
Alex Ling,
Rockville, Md