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Re: [APD] pH shock -- or -
--- revance at indiana_edu wrote:
>>
> I personally don't like doing large water changes
> (anything over 30%). I know
> lots of people talk about doing 50% and larger water
> changes but I would rather
> do many smaller water changes than a couple big ones. By
> doing frequent water
> changes it actually keeps the water more stable and
> consistent.
Not necessarily, but other things being equal, sure. Doing
continuous water change would be the most "consistent" so
long as you had continuous dosing of ferts, traces,
minerals, etc.
> Just because
> your water tests are ok doesn't mean you should not do a
> water change. There is
> more to your water than just the parameters you test.
You bet! Unless you have an awful lot of tests -- and then
you have to really like doing them ;-)
> Doing frequent water
> changes will help to keep other variables in check. In
> reality the more often
> you do water changes, the less drastic changes there will
> be.
Yep. So it's partly a question of practicality. Do 2 50%
changes in a row and it's only the equivalent of 75%
change. Do 3 and it's only 87%. With smaller changes, the
amount of water change gets even lower. Once you reduce the
size of the changes, it starts to take a lot more of them
to keep the water the same.
Tom's suggestion for 50% weekly has a lot going for it,
including allowing for estimative dosing, no excesses
building up, and only once a week changes.
Of course, for any number you pick, you can probably find
someone doing that amount, or that size of, water change.
Scott H.
=====
S. Hieber
- - - - - - - -
Aquascaping by Takashi Amano and more at
the AGA 2004 Annual Convention
Nov 12, 13 & 14; Marriott Crystal Gateway, Arlington, Virginia, USA
Aquatic Gardeners Association www.aquatic-gardeners.org
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