Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Cutrine Plus isn't working

I've never tried the Cutrine Plus, I use bags of Copper Sulfate crystals and disperse the stuff using scoops of the stuff in pool skimmer net and long pole. Just walk around the edge of my pond with it out several feet in the water. The resulting cloud/plume of diluted copper sulfate in the water in pretty impressive. Algae starts dying within the hour and is gone in a day. I do run my aerator the entire time.

I just reread my post and probably need to clear something up; I don't use bags of the copper sulfate all at once. I use about 3 or 4 cups of the crystals in the net and with that I do probably 75' of shoreline. Then I add a few more scoops and keep going till that's dissolved. I do this about 4 or 5 times in my 3 acre pond and that does about half the ponds shoreline, maybe a little less.