"Victor M. Martinez" wrote in message
...
Racf wrote:
My tank water is not alkaline, but the tap water is.

How is this possible/being done?

Normal metabolic processes in the tank reduce the pH of the water. I
think
the alkalinit of the tap water is at least in part produced by CO2, so
it's
easily removed by the plants.
The water pH usually hovers around 6.8-7.0, while the tap water is
around
9.

--
Victor M. Martinez

http://www.che.utexas.edu/~martiv


Makes sense. Sounds like your water is fairly soft although high in pH.
The water in nearby Minneapolis is like that. I think they add the
buffer to raise the pH so it does not eat up their old water mains. The
added KH is quickly consumed.