"Bob Adkins" wrote in message
...
On Mon, 4 Aug 2003 17:29:31 +0100, "Iain Miller" wrote:

all water entering the pond will be
filtered by grass and weeds, and a massive limestone filter to catch
grass
clippings etc.

Surely this will drive up the Kh of the water (and hence the Ph) ?

The pond will be filled with rain water, which has a pretty low Ph. The
soil
here is also fairly acid. I anticipate having to add tons of lime.

I have no idea what Kh is. Something to do with potassium?

Carbonate/Temporary hardness.