I have pond owners that swear by barley straw and some they swear at Barley straw. Sometimes it works and sometimes it doesn't. As far as using regular hay to control algae growth you are on you own with this one. Do a search for barley straw using the search feature and there has been a fair amount of previous discussions about barley straw. One key feature that I read today in a scientific report was that the straw needs water circulation through the straw to get at least some noticable algae control affects. The researchers were not impressed with the algae control from using barley straw.


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