Please describe what your definition of KH is.

"LeighMo" wrote in message
...
Injecting CO2 into water will lower the pH and raise the KH.

You're half right.

Injecting CO2 will lower the pH.

It *might* raise the KH if you have something in the tank that will
dissolve
with more acidic water. But most of us don't. Most people don't put
anything
in their tanks that will dissolve in the water and increase its hardness.

For the vast majority of planted tank keepers, adding CO2 will not affect
KH.


Leigh

http://www.fortunecity.com/lavender/halloween/881/