Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants diuron 80df

I worked for the city for a few years and my dad worked there almost 30 yrs. Every year the city park lakes (2) one 6 acres the other about 10 were always treated with karmax until it was discontinued awhile bak now they are all treated with diuron. These lakes always look excellent and have trees all around them that are very old and young which all seem to be doing very well. Never seen a single dish floating after use. And the stuff worked great and we did the whole lake at one time. However when I built my house on my lake I bought diuron and actually read the label because of concerns to my drinking water well. I don't use it ony pond needless to say. But the stuff I have used to try and control primrose doesn't work worth a sh*t compared to karmax or diuron.. Just my input