Wire netting, in either galvanised or PVC coated form, can be used for things such as crop protection or animal enclosure, and will keep your pond clear of debris and fallen leaves.
And remember: wire netting is inexpensive and has many uses in the garden. Use it to make plant supports, which last well and soon become hidden in a big border, or to lay over newly-planted bulbs until cats, foxes and squirrels lose interest. It can also be used to support flopping plants. Remember to net your pond before autumn leaves start to fall. Small mesh weighted down with bricks or stones will save the water from becoming polluted by leaves or debris.