"CLAIRE" wrote in message
om...
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?

Here are some topics on that subject:

http://www.iheartmypond.com/topiclis...c1=Winterizing

BV.
www.iheartmypond.com