I'm glad to hear it worked for you. The only area we get string algae anymore is the waterfall, but it does slow the water flow and even diverts it if it gets thick enough, so we try to keep ahead of it. We've found we have to treat less and less each year. This year we've only used the SP twice - once in the early spring and then just last week - and we're probably good for the season. The first year we were dealing with string algae every other week it seemed - pulling it up by the netful from the bottom, trying to keep it from strangling our plants, and yanking it off the waterfall by the armful. That was no fun! I kept telling myself it was helping my pond by consuming the excess nutrients, but it sure isn't pretty!