Most of the people that contact me with pond problems AFTER using Karmex tell me they got it at their local farm and ranch center, coop, etc. My experience with employees at Coops is that they are very knowledgeable about ag related stuff, but know very little or nothing about aquatic vegetation management. I would certainly advise anyone planning to treat vegetation in their lake to ask somebody who specializes in aquatic vegetation. Kudo's to Mr. Duffy for his input on this board.