On Fri, 16 Jul 2010 19:18:18 -0700, Judy Zappacosta
wrote:

On Fri, 16 Jul 2010 10:09:48 -0700 (PDT), Thomas wrote:

In the winter I use the Zamboni on the pool to level the ice, but I have
to be sure that the pool is frozen solid.

4 inches is enough.

What is a Zamboni?

http://www.dochertyfamily.com/zamboni.htm