Re: [APD] pH in the filters & root zone (Raj)

[Raj <ggrk at blr_vsnl.net.in>]

No, that's positively not the reason. The meter is permanently
in use between tanks. The reading are done on a continuos basis
and the only time the reading go off is when the batteries need
changing. I check and calibrate regularly, traits of an electronics
engineer?

The tolerance will not vary by 0.3 that's for sure, specially when
the filter is unclogged.

This phenomenon has faithfully occurred every time for years.

Raj

At 01/09/05, you wrote:
>Hmm, another control factor -- If you are using an
>electronic pH tester, a variation of 0.3 units pH could
>also be within the tolerance of your tester at diff temps,
>even if it is "temperature compensated," the solid state
>devices behave a little diff at diff temps.
>
>Scott H.
>--- Raj <ggrk at blr_vsnl.net.in> wrote:
>
> > Peter,
> >
> >          I have two identical tanks one CO2 injected and
> > the other with a
> > spraybar. This occurs in both tanks. I have noted a 0.3 -
> > 0.4 increase. On
> > water flow, a week later pH returns to normal but the
> > water flow is still
> > like new. I continuously monitor pH therefore I notice. I
> > wonder if anyone
> > else has observed any change in pH? Probably more due to
> > organic
> > decomposition in the filter ?
> >
> >          Also KH, GH and a whole lot of variable will
> > also play a part.
> >
> > Cheers
> > Raj
> >
> > At 01/09/05, you wrote:
> > > >         I have noticed that when I unclog my choked
> > (Eheim 2217)
> > > >canister filter by washing out *only* the first
> > (lowest) layer sponge,
> > > >the pH rises in the tank. The pH returns back to
> > normal after a week
> > > >or so.
> > >
> > >By the way.. just how much of a PH difference?
> > >
> > >Cleaning a filter out is doing at least two things...
> > it's increasing the
> > >flow of your filter and removing the bacteria from the
> > sponge.
> > >
> > >Nitrification consumes oxygen and creates an acid so the
> > slowing down of
> > >this could increase your PH
> > >
> > >But it also (and I'd guess more probable) could be the
> > increased flow of
> > >your filter is making you lose more CO2.  Agitated
> > surface water, a
> > >wet/dry filter etc will allow CO2 to escape the tank
> > water and that will
> > >cause a higher PH, just as adding CO2 lowers PH.   It
> > would return to it's
> > >regular level once the filter slowly gets reclogged.
> > >
> > >Cheers,
> > >Peter.
> >
> > _______________________________________________
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> > Aquatic-Plants at actwin_com
> > http://www.actwin.com/mailman/listinfo/aquatic-plants
> >
>
>
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-- 
Raj, vu2zap
Bangalore, South India.


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