Re: [APD] RE:1st Planted Tank questions

["S. Hieber" <shieber at yahoo_com>]

If you assume none of the "new" water mixes with any of the
"old", then there is no time diff. Of course, that's a
fancifully unreasonable assumption.

If you assume complete mixing, then the time diff works out
to about 8 hours or so. For practical purposes, the
situation is somehwere inbetween.

sh
--- "Richard J. Sexton" <richard at aquaria_net> wrote:

> At 06:21 AM 12/19/2004 -0800, you wrote:
> >This will take mcuh longer than just draing out 80% and
> >then replacing because, if you add and siphon at the
> same
> >time, much of the water you are siphoning out is the
> water
> >you just put into the aquarium. One can do a little
> >calculus to figure out how much time this adds; the
> >increase in time is pretty phenomenal, you can easily
> add
> >hours to a task that should only take less than half an
> >hour.
> 
> Add hours? Uh no. Put the out put at the back and siphon
> from the front.
> It may take a bit longer but the tank is never less than
> a bucket from
> being full; the problem with leaving 20% of the water in
> there
> only is that all the plants flop over and sometimes get
> bent
> permanentnly, albeit slightly.
> 
> With two pytings of course it's all just automatic. Hook
> them
> up, let them go and you can chnage 100% of water per
> hour.
> 
> 
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> 
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