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Freezing ponds?

I have been trying out different ways to stop my pond and bird bath from freezing this winter. The best thing for the pond so far has been a size 3 football. It has not stopped the whole pond from freezing but it has kept the ice from freezing beneath it so i have removed the ball in the morning leaving the water open for any birds to access.

I tried a ping-pong ball in the bird bath but no joy, it froze solid. The same happened with a tennis ball. The best method so far has been to empty it in the evening and refill in the morning!

Anyone other suggestions for effective floating devices?

As frustrating as freezing ponds are, for us and the birds, do not be tempted to use salt, oil or sugar in the bird baths!!!

Warden Intern at Otmoor.