Re: [APD] Re: Nutrients, Water Changes, Etc.

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

What I was trying to point out, just as a mathematical fact
is that the ppm never completely levels off if you are
doing regular additions and regular water changes (whether
daily or monthly, etc.); the curve always continues to
rise, ever more gradually. For most intents and purposes,
one can consider that it ceases to climb because the
increases become so very small -- literally, infintely
small if you follow the math.

In the real world, no one does exact dosing or exactly,
say, 50% water changes every time. Heck, who would bother
to try to measure so finely anywhow? ;-)

So the ppm will rise and fall.

But at least it's not a Cantorian infinity!

Scott H.


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

> 
> Provided you have a fairly constant rate of
> fertilisation, and are doing some waterchanges (any
> amount, in fact), then the level of the nutrient will
> always tend towards a FINITE value, not an infinite
> value... even if you are only changing a tiny fraction
> (ignoring evaporation). Of course, the more you change,
> the lower this value will be.

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