On 29 Jan 2004 08:51:36 -0800, (CLAIRE)
wrote:

we have tried putting a tennis ball in the centre of our garden pond
to stop the water from freezing however, with the bad weather recently
this hadn't worked. Can anyone suggest an alternative?

I am in Southern NH - very cold winter here. My bubbler almost did
the jobby itself but I had to add a trough heater when it got really
cold.

John