On Sun, 17 Feb 2008 17:26:01 GMT, "Donna Ohl, Grady Volunteer
Coordinator" wrote:

On Sun, 17 Feb 2008 10:52:25 -0600, Vic Smith wrote:
The hot and cold pipes could be different ages, or the mineral content
could precipitate differently that what has been my experience, which
is the hot water scaling up much more.

Hi Vic,

I was thinking it was the condensation on the cold-water pipe (being in the
unheated garage) that allowed the scaley white crust to build up only on
the cold-water pipe.

We recently moved here so we don't know what the history is on the
hot-water pipe; maybe it is simply newer.

Could be. I was talking about the inside of the pipe, where
condensation isn't an issue. I've seen some hot water pipes which
were almost completely clogged with scale. I believe it's because
the heat causes the mineral solution to more readily deposit on the
steel.

--Vic