TWO THINGS THAT WORK IN GARDEN PONDS ,BARLEY STRAW, ANY BIG PET STORE WILL HAVE IT OR CAN ORDER IT. THE OTHER IS GREENEX, LOOK UP GREENEX. COM, THE GARDEN SHOP HAS IT AND POND SUPPLIES. I USE GREENEX IN MY THREE ACRE POND IT DOES WORK. ONE TREATMENT LAST ALL SUMMER.
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