Hal wrote:
Someone used a net bag with a stream of water pumped into the opening
that was half submerged. That should work well in a round pond, but
mine has some dead spots the current from the pumped stream didn't
effect. Hal

Here's the one I was thinking of, though the picture doesn't it do it
justice as far as showing how it works:
http://preview.tinyurl.com/ynw9ul ~ jan
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Zone 7a, SE Washington State