I used clipper last season with GREAT success wiping out watermeal quickly! Some tips I have learned is to spray it immediately once mixing in the tank and apply as early in the morning as you can. It is greatly affected by PH and breaks down very fast in water with high PH. Waters with low PH are much better suited for clipper. With high PH water you have to mix and spray immediately first thing in the morning.

Also I mix in a little diquat which seemed to form a dynamite combination. We cleared out tons of watermeal last season that was normally unkillable!