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Barley straw for pond?

I've got a small garden fish pond - about 1m*2m, with 5 goldfish. It has got a bit murky in the hot weather, with a fair bit of slimy weed growing and a little white foam. I've pulled out a load of weed, and I've heard barley straw suggested as an old style remedy for excess weed/slime. Would I just float one of these in the pond?

Thanks! Hope this is the right forum, but feel free to move if not.


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