"Michael" wrote in message
et...
Granted - water changes are the best way to go to get the best water
quality, but sometimes a water change is not adequate:

1. meds removal
2. PH change due to CO2 injection.

Unless you change ALL of the water and clean the tank, residual meds will
be left behind. Carbon run for 7 days will eliminate it (to near zero).
I inject CO2 and the PH has dropped somewhat. Changing the water will
cause the PH to jump too quickly. Using Carbon allows me 'clean' the
water without changing it until I am ready to do it...a little bit at a
time to avoid PH shock.
===================
Please check this out but I was told that carbon does not remove *all*
pollutants from water. To remove meds I do large water changes over a few
days. But I can see that would be a problem for you. How about 10% for a
week or so?
--
ZB....
Frugal ponding since 1995.
rec.ponder since late 1996.
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
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