I was reading a novel based on Japanese gardening and found this. Copper wire made onto balls and put in ponds stops the growth of algae. Might give it a try.
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Copper wire balls
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Presumably this is not a good idea if you have fish?Our England is a garden, and such gardens are not made
By singing-'Oh how beautiful!" and sitting in the shade,
While better men than we go out and start their working lives
At grubbing weeds from gravel paths with broken dinner-knives. ~ Rudyard Kipling
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