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Re: [APD] CO2 Needle Valve -- or - Rolling down reasons for solenoids

--- Andrew McLeod <thefish at theabyssalplain_freeserve.co.uk>

> > . . .if
> you
> > don't have [a solenoid], your pH will proably only 
> > swing 0.2
> > units
> > between highest and lowest points, so what's the big
>  >deal?
> Is this still true in soft water (<60ppm CaCO3) and very
> soft water?

It is for me. I add CaCO3 and baking soda to raise the the
KH an GH up to about 4. That's still soft, wouldn't you
say? The water from the tap is about 1 or 2 degrees GH and

I don't think CaCO3 as starts to precipitate until you get
up somewhere around or over pH 8. So it's all dissolved
below that level.  When there's precipitate, the amount of
precitpate can increase or decrease in response to acids
and thereby hold the pH stable 8 (or whatever it is for
CaCO3).  But at KH 4 with CO2 added, the pH is going to be
below 7. I think this means, basically ;-) that the amount
of CO2 does not vary much when you run the CO2 nonstop.

Scott H

S. Hieber

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